SegueGenerator: Skip segues that have an empty identifier #555
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This PR causes the generator to skip any segues with an empty string identifier.
For some types of segues, such as from a UIButton to another view controller, a segue identifier is not required. When it is required, for example in a view controller initiated segue, Xcode will warn the user about it already, so R.swift doesn't need to warn about either case.
I'm not sure if I fixed it in the correct place, please let me know if you know a better way. :)
Closes #525