Minor nitpick - callout empty arrays are not falsy
Minor nitpick - callout empty arrays are not falsy

I thought it would be helpful (especially to those new to JS) to be (slightly) more explicit about Ember treating ```[]``` differently here than "vanilla JS". A minor point I realize, do with it what you will.

As a new Ember user I'm impressed with the guides - great work! Thanks for all the work that went into these!
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