applets/devicenotifier: Check StorageAccess being null

Kai Uwe Broulikrequested to merge
work/kbroulik/devicenotifier-check-storageaccess into master

Original commit message(s)

  • applets/devicenotifier: Check StorageAccess being null

It is also connected to OpticalDrive which is not a storage access.

Reason for the change

Crash fix

Test plan

None

Bugs fixed

BUG: 522051

@littlesweet

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