prevent empty support messages in help module (Fixes: #3697)

Florian Schaal

2016-05-26 52a8e7e2f53b23f41b40aa5bc5b35f338aaec3dd

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amavis unix - - - - 2 smtp
        -o smtp_data_done_timeout=1200
        -o smtp_send_xforward_command=yes