Fix failing test.

MagicMock will say that they have any method, for example "api_method",
however they have no __name__ member so a simple verification that the method
has a __name__ is added.

mycroft/skills/core.py

@@ -589,8 +589,7 @@ def wrapper(message):
         attributes = [a for a in dir(self) if a not in excluded]
         for attr_name in attributes:
             method = getattr(self, attr_name)
-
-            if hasattr(method, 'api_method'):
+            if hasattr(method, 'api_method') and hasattr(method, '__name__'):
                 doc = method.__doc__ or ''
                 name = method.__name__
                 self.public_api[name] = {