Write tests for service multi_media_pick_service.dart

[palisadoes]

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

We will need unittests done for all methods, classes and functions found in this file.

Any widgets referenced in this file must also have unittests done

lib/services/third_party_service/multi_media_pick_service.dart

PR Acceptance Criteria

• When complete this file must show 100% coverage when merged into the code base.
• The current code coverage for this file can be found here:
  • https://app.codecov.io/gh/PalisadoesFoundation/talawa?displayType=list
• The PR will show a report for the code coverage for the file you have added. You can use that as a guide.
• No functionality must be removed to achieve this goal.

[Azad99-9]

@noman2002 please assign this issue to me.

[github-actions]

This issue did not get any activity in the past 10 days and will be closed in 180 days if no update occurs. Please check if the develop branch has fixed it and report again or close the issue.

[shahzeelahmed]

@noman2002 could you please assign this issue to me

[Azad99-9]

@noman2002 @Cioppolo14 @Kevoniat please assign this issue to me and also could any one of you please reopen this PR as i have already worked on fixing both the issues #2259 & #2162.

[Azad99-9]

@Cioppolo14 @noman2002 please close this issue as it is fixed in #2265 PR.