Added a fix for bug #2140. Opera doesn't like concating null or undefined values.
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@ -207,7 +207,7 @@ jQuery.event = {
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// Handle triggering of extra function
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if ( extra && jQuery.isFunction( extra ) ) {
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// call the extra function and tack the current return value on the end for possible inspection
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ret = extra.apply( elem, data.concat( val ) );
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ret = extra.apply( elem, val == null ? data : data.concat( val ) );
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// if anything is returned, give it precedence and have it overwrite the previous value
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if (ret !== undefined)
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val = ret;
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