Add missing error message

Author: markerikson

errors.json

@@ -15,5 +15,6 @@
   "13": "The slice reducer for key \"\" returned undefined when probed with a random type. Don't try to handle '' or other actions in \"redux/*\" namespace. They are considered private. Instead, you must return the current state for any unknown actions, unless it is undefined, in which case you must return the initial state, regardless of the action type. The initial state may not be undefined, but can be null.",
   "14": "When called with an action of type , the slice reducer for key \"\" returned undefined. To ignore an action, you must explicitly return the previous state. If you want this reducer to hold no value, you can return null instead of undefined.",
   "15": "Dispatching while constructing your middleware is not allowed. Other middleware would not be applied to this dispatch.",
-  "16": "bindActionCreators expected an object or a function, but instead received: ''. Did you write \"import ActionCreators from\" instead of \"import * as ActionCreators from\"?"
+  "16": "bindActionCreators expected an object or a function, but instead received: ''. Did you write \"import ActionCreators from\" instead of \"import * as ActionCreators from\"?",
+  "17": "Action \"type\" property must be a string. Instead, the actual type was: ''. Value was: '' (stringified)"
 }