Werk #15624: mk_logwatch.py: Do Not Crash Upon Entering Invalid Option

Previously, if the user entered an invalid option into a configuration file for mk_logwatch.py, the plugin would crash with the traceback:

ValueError: Invalid overflow: 'c' (choose from dict_keys(['C', 'W', 'I', 'O']))

or similar. This would cause the output to be assigned to the wrong service, since no section header was produced. With this Werk, the traceback will only be shown, if the option --debug is used. This is analogous to what happens if the configuration file is missing.

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