Checks if the incident tactical group exists before adding it to the …

…case storage (#3707)

src/dispatch/case/flows.py

@@ -593,7 +593,7 @@ def case_to_incident_escalate_flow(
  case_id=case.id,
  )
 
- if case.storage:
+ if case.storage and incident.tactical_group:
  # we add the incident's tactical group to the case's storage folder
  # to allow incident participants to access the case's artifacts in the folder
  storage_members = [incident.tactical_group.email]