work around parser.get_process_dependencies returning a set containing the element None

spiffworkflow-backend/src/spiffworkflow_backend/scripts/get_current_user.py

@@ -9,8 +9,8 @@ from spiffworkflow_backend.models.script_attributes_context import (
 from spiffworkflow_backend.scripts.script import Script
 
 
-class GetUser(Script):
-    """GetUser."""
+class GetCurrentUser(Script):
+    """GetCurrentUser."""
 
     def get_description(self) -> str:
         """Get_description."""

spiffworkflow-backend/src/spiffworkflow_backend/scripts/get_process_info.py

@@ -8,7 +8,7 @@ from spiffworkflow_backend.scripts.script import Script
 
 
 class GetProcessInfo(Script):
-    """GetUser."""
+    """GetProcessInfo."""
 
     def get_description(self) -> str:
         """Get_description."""

spiffworkflow-backend/src/spiffworkflow_backend/services/process_instance_processor.py

@@ -732,6 +732,10 @@ class ProcessInstanceProcessor:
         if processed_identifiers is None:
             processed_identifiers = set()
         processor_dependencies = parser.get_process_dependencies()
+
+        # since get_process_dependencies() returns a set with None sometimes, we need to remove it
+        processor_dependencies = processor_dependencies - {None}
+
         processor_dependencies_new = processor_dependencies - processed_identifiers
         bpmn_process_identifiers_in_parser = parser.get_process_ids()