Exception raised in ipa file doesn't contain icons if app.icons is called

The line 

info['CFBundleIcons']['CFBundlePrimaryIcon']['CFBundleIconFiles'].each do |name|

In the file app.rb is the culprit

recommend adding

return [] unless info['CFBundleIcons'] && info['CFBundleIcons']['CFBundlePrimaryIcon'] && info['CFBundleIcons']['CFBundlePrimaryIcon']['CFBundleIconFiles'].length > 0

 Great Gem :) Thanks for your hard work. 
