This should be fixed

I finished making a movie for a school project and then deleted the videos I used off my camera roll. When I went back on iMovie, it said that there were missing videos and it wouldnt let me do anything with the movie. The project was deleted off iMovie because I deleted the videos I used off my camera roll. The videos should save and stay on iMovie wether or not theyre on or off my camera roll!? PLEASE FIX THIS!!!

Mik04104 about iMovie, v2.2.3