Import invalid URL

[RodrigoWebDev]

• We need to show an error popup if the user try to import a invalid playlist URL.
• A valid playlist URL needs to contain the following string: http://www.youtube.com/watch_videos?video_ids=
• If the url is invalid, it should show a popup with the title "Invalid URL" and a button "Ok"

[LK1Anonimo]

only if it's now!!!