SW-609: Fix Exception.message issue in webservice.py

SAS/ResourceAssignment/ResourceAssignmentEditor/lib/webservice.py

@@ -526,7 +526,7 @@ def putTask(task_id):
 
                         time.sleep(0.2)
                 except RPCException as e:
-                    if 'does not exist' in e.message:
+                    if 'does not exist' in str(e):
                         # task does not exist (anymore) in otdb
                         #so remove it from radb as well (with cascading deletes on specification)
                         logger.warn('task with otdb_id %s does not exist anymore in OTDB. removing task radb_id %s from radb', task['otdb_id'], task['id'])