Allow falsy responses (e.g. 0 not as a string).

Author: ftobia

pact/pact.py

@@ -326,7 +326,7 @@ def __init__(self, status, headers=None, body=None):
     def json(self):
         """Convert the Response to a JSON version for the mock service."""
         response = {'status': self.status}
-        if self.body:
+        if self.body is not None:
             response['body'] = self.body
 
         if self.headers: