Another small change to reduce PHP notices.
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@ -114,6 +114,7 @@ class Upload implements Extension {
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throw new UploadException("Can not upload more than one image for replacing.");
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}
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$source = isset($_POST['source']) ? $_POST['source'] : null;
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$tags = ''; // Tags aren't changed when uploading. Set to null to stop PHP warnings.
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if (count($_FILES)) {
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