Merge branch 'clebergnu-test_without_a_file'

avocado/core/test.py

@@ -263,11 +263,14 @@ class Test(unittest.TestCase):
         """
         Returns the name of the file (path) that holds the current test
         """
-        possibly_compiled = inspect.getfile(self.__class__)
-        if possibly_compiled.endswith('.pyc') or possibly_compiled.endswith('.pyo'):
-            source = possibly_compiled[:-1]
-        else:
-            source = possibly_compiled
+        try:
+            possibly_compiled = inspect.getfile(self.__class__)
+            if possibly_compiled.endswith('.pyc') or possibly_compiled.endswith('.pyo'):
+                source = possibly_compiled[:-1]
+            else:
+                source = possibly_compiled
+        except TypeError:
+            return None
 
         if os.path.exists(source):
             return source