Merge pull request #21692 from dominickuo/bug-1032638

Bug 1032638 - [Music] Ignore the MP4 files with not enough metadata, r=jimporter(cherry picked from commit 968c5d2df7b5416fc18b852fa1cb372d366d8c75)
Bug 1038080 - [tarako]Cache only partial amounts of album photos in the music list to save the memory in music player.