STTweetLabel can crash on double newline connected with non-whitespace word

It crashes when there's post word after newline. Example text: "Josh released All That Echoes.\n\nPurchase the deluxe album at Target: http://tgt.com/WUNjoW\n\nAlso available at:\nAmazon: http://bit.ly/106p5Jw\niTunes: http://bit.ly/SpwTl9\nHSN: http://bit.ly/SY4fvN\nBarnes & Noble: http://bit.ly/12qxSJf\n\nInt'l release dates: http://bit.ly/VWPUi3\n\nTrack Listing:\n\n1. Brave\n2. False Alarms\n3. Falling Slowly\n4. She Moved Through the Fair\n5. Below the Line\n6. E Ti Prometterò\n7. The Moon's a Harsh Mistress\n8. Un Alma Mas\n9. Happy in My Heartache\n10. Hollow Talk\n11. Sincera\n12. I Believe (When I Fall in Love It Will Be Forever)"