plugin XEP-0329: correctly handle error if something is wrong when getting file from component.

sat/plugins/plugin_xep_0329.py

@@ -580,6 +580,13 @@ class XEP_0329(object):
         except exceptions.NotFound:
             self._iqError(client, iq_elt)
             return
+        except exceptions.PermissionError:
+            self._iqError(client, iq_elt, condition='not-allowed')
+            return
+        except Exception as e:
+            log.error(u"internal server error: {e}".format(e=e))
+            self._iqError(client, iq_elt, condition='internal-server-error')
+            return
         iq_result_elt = xmlstream.toResponse(iq_elt, "result")
         query_elt = iq_result_elt.addElement((NS_FIS, "query"))
         query_elt[u"node"] = node_path