Fix flaky test cases and OEM device failed test cases
1. Add NPE check on receiver and fix some logic to fix some flaky tests. 2. Use DEVICE_NAME rather than Build.MODEL to get storage root name. Bug: 143499864 Test: atest DocumentsUIGoogleTests Change-Id: I71d934c593560a7822d6fe7523b92c227c738e22 Merged-In: I71d934c593560a7822d6fe7523b92c227c738e22
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