moment/moment-timezone — pull request #115 by askhogan (2014-08-07 02:35:12+00:00)
Title: Add console error when moment.momentProperties undefined

I had an error where it said _z is undefined. This took me about 5 minutes to breakpoint the code, which lead me back to the site where I found moment 2.6 was required. Because this threw an uncaught error other items broke like not being able to load data. By having if statement you get the benefit of

#1 No uncaught exception where user is confused
#2 User gets a helpful message in their console and a link to correct the dependency

Thanks for the great library!