Commented Task: Improve Undefined Tests [10121]

@HughAJWood: People DO NOT DO if (id != undefined) DO if (typeof(id) !== 'undefined') #JavaScript #WriteGoodCode

Original Message:
http://twitter.com/HughAJWood/status/298422582011654144

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Comments: For consistency, all undefined checks are now in the form typeof variable === "undefined" This is consistent with the JavaScript Style Guide Matt posted here and reliable.