Add check for result=None in clean_queue

Author: achetverikov

nipype/pipeline/plugins/base.py

@@ -156,11 +156,7 @@ def run(self, graph, config, updatehash=False):
                     notrun.append(
                         self._clean_queue(
                             jobid,
-                            graph,
-                            result={
-                                'result': None,
-                                'traceback': '\n'.join(format_exception(*sys.exc_info()))
-                            }))
+                            graph))
                 else:
                     if result:
                         if result['traceback']:
@@ -222,6 +218,9 @@ def _clean_queue(self, jobid, graph, result=None):
 
         if self._status_callback:
             self._status_callback(self.procs[jobid], 'exception')
+		if result is None:
+			result={'result': None,
+					'traceback': '\n'.join(format_exception(*sys.exc_info()))}
 
         if str2bool(self._config['execution']['stop_on_first_crash']):
             raise RuntimeError("".join(result['traceback']))