workflow: import InteractionWorkflowDefinition only if WITH_LEGACY_WORKFLOW is True.

product/ERP5Type/Base.py

@@ -3534,7 +3534,11 @@ class Base(
 
     # Use meta transition to jump from one state to another
     # without existing transitions.
+    from Products.ERP5Type import WITH_LEGACY_WORKFLOW
+    if WITH_LEGACY_WORKFLOW:
       from Products.ERP5.InteractionWorkflow import InteractionWorkflowDefinition
+    else:
+      InteractionWorkflowDefinition = None.__class__
     from Products.ERP5Type.Core.InteractionWorkflow import InteractionWorkflow
     portal = self.getPortalObject()
     workflow_tool = portal.portal_workflow

product/ERP5Type/Tool/WorkflowTool.py

@@ -98,7 +98,10 @@ class WorkflowTool(BaseTool, OriginalWorkflowTool):
     This is public method to allow passing meta transition (Jump form
     any state to another in same workflow)
     """
+    if WITH_LEGACY_WORKFLOW:
       from Products.ERP5.InteractionWorkflow import InteractionWorkflowDefinition
+    else:
+      InteractionWorkflowDefinition = None.__class__
     from Products.ERP5Type.Core.InteractionWorkflow import InteractionWorkflow
     workflow_list = self.getWorkflowValueListFor(ob.getPortalType())
     if wf_id is None:
@@ -124,7 +127,10 @@ class WorkflowTool(BaseTool, OriginalWorkflowTool):
     """Test if given state_id is available for ob
     in at least one associated workflow
     """
+    if WITH_LEGACY_WORKFLOW:
       from Products.ERP5.InteractionWorkflow import InteractionWorkflowDefinition
+    else:
+      InteractionWorkflowDefinition = None.__class__
     from Products.ERP5Type.Core.InteractionWorkflow import InteractionWorkflow
     for workflow in (wf_id and (self[wf_id],) or self.getWorkflowValueListFor(ob.getPortalType())):
       if not isinstance(workflow, (InteractionWorkflowDefinition,