fix: replace Exception with ValueError for uninitialized workflow run and graph runtime state

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/core/app/apps/workflow/generate_task_pipeline.py

@@ -218,7 +218,7 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
                     break
                 else:
                     yield MessageAudioStreamResponse(audio=audio_trunk.audio, task_id=task_id)
-            except Exception as e:
+            except Exception:
                 logger.exception(f"Fails to get audio trunk, task_id: {task_id}")
                 break
         if tts_publisher:
@@ -258,6 +258,8 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
                 event,
                 QueueNodeRetryEvent,
             ):
+                if not workflow_run:
+                    raise ValueError("workflow run not initialized.")
                 workflow_node_execution = self._handle_workflow_node_execution_retried(
                     workflow_run=workflow_run, event=event
                 )
@@ -272,7 +274,7 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
                     yield response
             elif isinstance(event, QueueNodeStartedEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 workflow_node_execution = self._handle_node_execution_start(workflow_run=workflow_run, event=event)
 
@@ -308,45 +310,45 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
 
             elif isinstance(event, QueueParallelBranchRunStartedEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 yield self._workflow_parallel_branch_start_to_stream_response(
                     task_id=self._application_generate_entity.task_id, workflow_run=workflow_run, event=event
                 )
             elif isinstance(event, QueueParallelBranchRunSucceededEvent | QueueParallelBranchRunFailedEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 yield self._workflow_parallel_branch_finished_to_stream_response(
                     task_id=self._application_generate_entity.task_id, workflow_run=workflow_run, event=event
                 )
             elif isinstance(event, QueueIterationStartEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 yield self._workflow_iteration_start_to_stream_response(
                     task_id=self._application_generate_entity.task_id, workflow_run=workflow_run, event=event
                 )
             elif isinstance(event, QueueIterationNextEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 yield self._workflow_iteration_next_to_stream_response(
                     task_id=self._application_generate_entity.task_id, workflow_run=workflow_run, event=event
                 )
             elif isinstance(event, QueueIterationCompletedEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 yield self._workflow_iteration_completed_to_stream_response(
                     task_id=self._application_generate_entity.task_id, workflow_run=workflow_run, event=event
                 )
             elif isinstance(event, QueueWorkflowSucceededEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 if not graph_runtime_state:
-                    raise Exception("Graph runtime state not initialized.")
+                    raise ValueError("graph runtime state not initialized.")
 
                 workflow_run = self._handle_workflow_run_success(
                     workflow_run=workflow_run,
@@ -366,10 +368,10 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
                 )
             elif isinstance(event, QueueWorkflowPartialSuccessEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 if not graph_runtime_state:
-                    raise Exception("Graph runtime state not initialized.")
+                    raise ValueError("graph runtime state not initialized.")
 
                 workflow_run = self._handle_workflow_run_partial_success(
                     workflow_run=workflow_run,
@@ -390,10 +392,10 @@ class WorkflowAppGenerateTaskPipeline(BasedGenerateTaskPipeline, WorkflowCycleMa
                 )
             elif isinstance(event, QueueWorkflowFailedEvent | QueueStopEvent):
                 if not workflow_run:
-                    raise Exception("Workflow run not initialized.")
+                    raise ValueError("workflow run not initialized.")
 
                 if not graph_runtime_state:
-                    raise Exception("Graph runtime state not initialized.")
+                    raise ValueError("graph runtime state not initialized.")
                 workflow_run = self._handle_workflow_run_failed(
                     workflow_run=workflow_run,
                     start_at=graph_runtime_state.start_at,