Handle undefined steps

lettuce/plugins/subunit_output.py

@@ -94,10 +94,13 @@ def enable(filename=None):
     def after_step(step):
 
         if not step.passed:
+            try:
                 streamresult.status(test_id=get_test_id(step.scenario),
                                     file_name='traceback',
                                     file_bytes=bytes(step.why.traceback),
                                     mime_type='text/plain; charset=utf8')
+            except AttributeError:
+                pass
 
     @after.all
     def after_all(total):

tests/functional/test_subunit_output.py

@@ -226,3 +226,21 @@ def test_subunit_output_console():
 
     runner = Runner(feature_name('writes_to_console'), enable_subunit=True)
     runner.run()
+
+@with_setup(state.setup, state.teardown)
+def test_subunit_output_undefined_steps():
+    """
+    Test Subunit output with undefined steps
+    """
+
+    state.expect = [
+        Includes({
+            'status': 'fail',
+        }),
+        Includes({
+            'status': 'fail',
+        }),
+    ]
+
+    runner = Runner(feature_name('undefined_steps'), enable_subunit=True)
+    runner.run()