patoroco/JMGBlockSegue — pull request #1 by DavidBenko (2014-05-13 19:18:49+00:00)
Title: Fix crash if block is nil

Sending `nil` for block results in crash.
example: `[self performSegueWithIdentifier:@"Identifier" sender:nil withBlock:nil];`

Check that block != nil before configuring segue.