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This change makes jQuery skip falsy values in `addClass( array )` & `removeClass( array )` instead of stopping iteration when the first falsy value is detected. This makes code like: ```js elem.addClass( [ "a", "", "b" ] ); ``` add both the `a` & `b` classes. The code was also optimized for size a bit so it doesn't increase the minified gzipped size. Fixes gh-4998 Closes gh-5003