Fix notice in functions.php when saving mappings

If you save mappings without selecting any project it throws a notice because $_POST['cap_client_mapping'] doesn't exist. Also it was missing a break; for that select case.
Merge pull request #11 from MZAWeb/patch-1

Fix notice in functions.php when saving mappings
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Fixes #16, #18
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Closes #10 (ampersand conversion, ace markdown emphasis)
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Signed-off-by: Justin de Vesine <justin@crowdfavorite.com>
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