No commit message

No commit message

src/jflow/workflow.py

@@ -957,8 +957,8 @@ class Workflow(threading.Thread):
         sys.stdout.write('{0:>10} {1:>10} {2}\n'.format('', 'COMMAND', node.command))
 
     def _set_stderr(self):
-        if hasattr(self, "stderr") and self.stderr is not None:
-            os.rename( self.stderr, os.path.join(self.directory, str(time.time()) + self.STDERR_FILE_NAME + self.OLD_EXTENSION) )
+        if hasattr(self, "stderr") and self.stderr is not None and os.path.isfile(self.stderr):
+            os.rename( self.stderr, os.path.join(self.directory, str(time.time()) + "_" + self.STDERR_FILE_NAME + self.OLD_EXTENSION) )
         stderr = os.path.join(self.directory, self.STDERR_FILE_NAME)
         return stderr