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I'm currently trying to give my listings nice captions, so I decided to use something like this : 

    \DeclareCaptionFont{white}{\color{white}}
    \DeclareCaptionFormat{listing}{%
    \parbox{\textwidth}{\colorbox{gray}{\parbox{\textwidth}{#1#2#3}}\vskip-4pt}}
    \captionsetup[lstlisting]{format=listing,labelfont=white,textfont=white}

Which gives nice results. However, I would like the gray box not to be displayed when I don't specify a caption for a listing, which is not currently the case. I have a big ugly empty rectangle... Do you have any idea how I could achieve this ?

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Instead of just code snippets, please provide a complete, minimal document illustrating the problem. – Gonzalo Medina Aug 9 '12 at 16:58
With no MWE, this is 'too localized'. Request reopening if more data is available. – Joseph Wright♦ Sep 2 '12 at 13:29

closed as too localized by Joseph Wright♦ Sep 2 '12 at 13:28

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