Mock json error must be catched

[nikinci]

When mock json is incorrect or has error library dont catch gson exception so dont call Callback onError method. We can see excepiton from logcat but it must call also onError

at com.google.gson.Gson.fromJson(Gson.java:815)
at com.google.gson.Gson.fromJson(Gson.java:770)
at com.google.gson.Gson.fromJson(Gson.java:719)
at com.orhanobut.wasp.parsers.GsonParser.fromBody(GsonParser.java:32)
at com.orhanobut.wasp.MockNetworkStack.invokeRequest(MockNetworkStack.java:53)
at com.orhanobut.wasp.NetworkHandler.invoke(NetworkHandler.java:116)