Exception handling for when reading datastore. #1710
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What I have done and why
Datastore file can be corrupted in cases, or simply invalid. So there needs to handle runtime Fatal exception like I found:
FATAL EXCEPTION: main
Process: com.google.samples.apps.nowinandroid.demo.debug, PID: 10565
androidx.datastore.core.CorruptionException: Cannot read proto.
...
So exception handling is needed, and replaced with
UserPreferences.getDefaultInstance()when there occurs such exception