[BUG] To fix Fetch Request Call to get all newsFeed in case of no organization

[sumitra19jha]

Issue Description:

If user is part of no organisation at all the fetch request call shall not be executed

Issue Severity:

Low

Observed Behaviour:

I/flutter (18499): ClientException: Unhandled Failure Invalid argument(s): No host specified in URI nullgraphql I/flutter (18499): 1 I/flutter (18499): http://talawa-graphql-api.herokuapp.com/graphql/talawa/ E/flutter (18499): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: GraphQL Errors: E/flutter (18499): Cast to ObjectId failed for value "null" at path "organization" for model "Post": Undefined location E/flutter (18499): #0 ApiFunctions.gqlquery package:talawa/utils/apiFuctions.dart:30 E/flutter (18499): <asynchronous suspension> E/flutter (18499): #1 _NewsFeedState.getPosts package:talawa/…/newsfeed/newsfeed.dart:75 E/flutter (18499): <asynchronous suspension> E/flutter (18499):

Expected Behaviour:

No error shall be displayed

Steps to reproduce issue:

1. Open app
2. Go to the news feed
3. Make sure no organisation is selected

Does this issue need immediate attention?

No

Are you willing to work on this issue:

Yes