remove flash notice from unrectified map export and add catch for missing files if user tries to download a non existing file
remove flash notice from unrectified map export and add catch for missing files if user tries to download a non existing file

kartta-labs/mapwarper,timwaters/mapwarper,kartta-labs/mapwarper,kartta-labs/mapwarper,timwaters/mapwarper,kartta-labs/mapwarper,timwaters/mapwarper,kartta-labs/mapwarper,timwaters/mapwarper