Fallback to a NoOp ProtoLogImpl when viewer config is missing

Bug: 374125888
Flag: EXEMPT bug fix
Test: atest BubblePositionerTest
Test: atest com.android.internal.protolog.ProtoLogViewerConfigReaderTest#viewerConfigIsOnDevice
Change-Id: I4c4a9a3ac059a12591f8a57ecfa277a2b8180a35
3 files changed