Undefinex index CustomLinkLabel -- FIX for Multi Site Theme Manager

Line 202 of plugins/multisite-theme-manager/multisite-theme-manager-files/includes/functions.php:

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$details[$possible_data_name] = stripslashes($details[$possible_data_name]);
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modify to:

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if (isset($details[$possible_data_name]))
$details[$possible_data_name] = stripslashes($details[$possible_data_name]);
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