workflows: really log invalid status detection (#23894)

wcs/workflows.py

@@ -1700,15 +1700,14 @@ class WorkflowStatusItem(XmlSerialisable):
                 return [previous_status]
             return []
 
-        try:
-            return [x for x in self.parent.parent.possible_status if x.id == self.status]
-        except IndexError:
+        targets = [x for x in self.parent.parent.possible_status if x.id == self.status]
+        if not targets:
             get_publisher().get_app_logger().error(
                             'reference to invalid status in workflow %s, status %s, item %s' % (
                                     self.parent.parent.name,
                                     self.parent.name,
                                     self.description))
-        return []
+        return targets
 
     def get_jump_label(self):
         '''Return the label to use on a workflow graph arrow'''