sepolgen: audit.py Dont crash if empty data is passed

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This patch looks good to me. acked.

If you pass output from a log file that does not include any avc's audit2allow will crash. This patch fixes this problem.

ausearch -m avc -ts recent | audit2allow

If there was no AVC's recently, we do not want the python to crash. -----BEGIN PGP SIGNATURE-----
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