Resolvers: Create tests for createGroupChat.js

[palisadoes]

The Talawa-API code base needs to be 100% reliable. This means we need to have 100% test code coverage.

Tests need to be written for file lib/resolvers/group_chat_mutations/createGroupChat.js

• We will need the API to be refactored for all methods, classes and/or functions found in this file for testing to be correctly executed.
• When complete, all all methods, classes and/or functions in the refactored file will need to be tested. These tests must be placed in a
  single file with the name tests/resolvers/group_chat_mutations/createGroupChat.spec.js. You may need to create the appropriate directory structure to do this.

IMPORTANT:

Please refer to the parent issue on how to implement these tests correctly:

• Create all API Resolver Tests #490

PR Acceptance Criteria

• When complete this file must show 100% coverage when merged into the code base. This will be clearly visible when you submit your PR.
• The current code coverage for the file can be found here. If the file isn't found in this directory, or there is a 404 error, then tests have not been created.
• The PR will show a report for the code coverage for the file you have added. You can use that as a guide.

[saga0p]

can you assign this to me. I've already made the PRs for the existing issues which are assigned to me and I've also contacted the assigned reviewers on slack to review my PR. I'm available to work on this issue now