Checkmk Werk 13567: Raise in debug only if no cfg was found (mk_logwatch)

ID: 13567 Title: Raise in debug only if no cfg was found (mk_logwatch) Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 mk_logwatch.py was raising IOError in debug mode although a logwatch.cfg existed in either logwatch.d or MK_CONFDIR. It is now only raising if no configuration at all was found.