When downloading videos is in progress, app crashes.
Steps To Reproduce:
a) Login to edX app.
b) Select any course.
c) In course ware section, tap on down arrow with video count to download videos.
d) Tap on 'My Videos' from left navigation drawer.
e) Tap on 'All videos' (Sometimes app crashes on tapping all videos)
f) Tap on 'Downloading' wheel (Sometimes app crashes on accessing this screen)
g) Tap on any course card in 'All videos' section (Sometimes app crashes on accessing this screen)