[BUG] After login noticing that invitation routes are taking null for email

[rjtbansal]

GET http://localhost:3001/invitations/user/null/contacts?q= 401 (Unauthorized)
GET http://localhost:3001/invitations/user/requests/null 401 (Unauthorized)
GET http://localhost:3001/invitations/user/null 401 (Unauthorized)

[rjtbansal]

The app was functioning even before this but too many 401 errors would show up in the console. So the simple fix was to just check if email exists. When it finally does after re-rendering via useEffect, it then calls the invitation APIs thereby no longer throwing such an error