Fix broken unit test caused by addition of the job wrapper's

galaxy_virtual_env attribute

test/unit/jobs/test_runner_local.py

@@ -120,6 +120,7 @@ class MockJobWrapper( object ):
         self.output_paths = [ '/tmp/output1.dat' ]
         self.mock_metadata_path = os.path.abspath( os.path.join( test_directory, "METADATA_SET" ) )
         self.metadata_command = "touch %s" % self.mock_metadata_path
+        self.galaxy_virtual_env = None
 
         # Cruft for setting metadata externally, axe at some point.
         self.external_output_metadata = bunch.Bunch(