Fails ungracefully when image files do not obey MMQ DSL

[hparra]

At parseFilename

/Users/hparra/Repositories/background-imager/lib/image-filename-helper.js:43
            queries = results[2];
                             ^
TypeError: Cannot read property '2' of null
    at Object.ImageFilenameHelper.parseFilename (/Users/hparra/Repositories/background-imager/lib/image-filename-helper.js:43:30)
    at Object.ImageFilenameHelper.getClassname (/Users/hparra/Repositories/background-imager/lib/image-filename-helper.js:211:21)
    at Object.BackgroundImager.getImageFileInfo (/Users/hparra/Repositories/background-imager/lib/background-imager.js:227:28)
    at /Users/hparra/Repositories/background-imager/lib/background-imager.js:252:18
    at Array.map (native)
    at Object.BackgroundImager.getImageFileInfoArray (/Users/hparra/Repositories/background-imager/lib/background-imager.js:249:30)
    at Object.BackgroundImager.createMediaRules (/Users/hparra/Repositories/background-imager/lib/background-imager.js:308:14)
    at /Users/hparra/Repositories/background-imager/lib/background-imager-cli.js:36:17
    at Object.oncomplete (fs.js:107:15)