Fixing #236 which did not expect null from DownloadManager.query() #314
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Please note: I wasn't able to find contribution guidelines for PRs, so PR is against master as the issue-236 branch is quite stale.
This is a proposed fix to issue #236 which was due to a missing null check in onReceive() where DownloadManager.query() can return null, resulting in NullPointerException in some rare cases.