Add exception handling for fetchElections in ElectionsRepositoryImpl.kt and...

Fixes #448

Changes :
Handling the exception in ElectionsRepositoryImpl.kt class for fetchElections function to throw an exception, catching and handling these exceptions in the calling code in ElectionViewModel.kt and HomeViewModel.kt classes which are getting accessed in HomeFragment.kt and CalendarViewElectionFragment.kt fragments. I have also modified a few lines of codes in HomeFragment.kt to handle these exceptions with code re-usability.

Screenshots for the change:

Screen Recording for the change:
Screen_Recording_20230428-163155_Agora_Vote

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