Return 0 on nonexistent hash as with real redis

Author: greenape

flowmachine/tests/conftest.py

@@ -302,7 +302,10 @@ def hgetall(self, key):
         return self._store[key]
 
     def hdel(self, key, name):
-        del self._store[key][name.encode()]
+        try:
+            del self._store[key][name.encode()]
+        except KeyError:
+            return 0
 
     def set(self, key, value):
         self._store[key] = value.encode()