Silent mode, no cexpr if no violation is found #20
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If you use rubocop -a as autocmd on save, it will always open a cexpr.
This is quite irritating. This commits add a silent flag (--silent, -s) to supress this behaviour.
Also it prevents the cexpr to be shown if no violation is found, and shows a message instead.
In my opinion this should always be on, since it is useless to open an empty cexpr. But feel free to make it configurable if wanted.