Check output stream health before and while writing - #36
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…te to a bad output stream in a loop.
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Handle output file failures by logging an error and not trying to write to a bad output stream in a loop.
This fixes a failure where if you try to write an output file to a directory that does not exist, or something goes wrong while writing, IBDMap will just spin 100% CPU as it tries to write to an unhealthy stream over and over in a loop.