fix: Prevent a NPE

Description

Both noAccountView() and onAccountAvailable() methods can return early, ending up in a RemoteViews not instanciated.

This fixes a crash spotted by sentry: https://murena-sas.sentry.io/projects/edrive/?project=4504355892101120

Screenshots

Technical details

Tests

Issues

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Summary by CodeRabbit

• Bug Fixes
  • Improved the app widget's update process by adding a safeguard to prevent null pointer exceptions, enhancing stability and reliability.