Fix NPE of ContentResolver query cursor. #1518
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When ContentProvider not ready, a query from content resolver may return a null cursor, we need to detect this, instead of wrap to FlowCursor direct. The issue may happen when query across process, that other App may not installed, or provider not setup yet.
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When ContentProvider not ready, a query from content resolver may return
a null cursor, we need to detect this, instead of wrap to FlowCursor
direct.
The issue may happen when query across process, that other App may not
installed, or provider not setup yet.