CC-4663: Smart Blocks -> Deleting a track in smart block from library gives error
CC-4663: Smart Blocks -> Deleting a track in smart block from library gives error

-fixed
-tracks with undefined mime type were not handled properly

sourcefabric/airtime,Ryex/airtime,justvanbloom/airtime,justvanbloom/airtime,sourcefabric/airtime,sourcefabric/airtime,thnkloud9/Airtime,comiconomenclaturist/libretime,sourcefabric/Airtime,thnkloud9/Airtime,Ryex/airtime,radiorabe/airtime,Lapotor/libretime,Lapotor/libretime,Ryex/airtime,radiorabe/airtime,radiorabe/airtime,sourcefabric/Airtime,LibreTime/libretime,justvanbloom/airtime,ReganDryke/airtime,ReganDryke/airtime,sourcefabric/Airtime,ReganDryke/airtime,comiconomenclaturist/libretime,LibreTime/libretime,Ryex/airtime,Lapotor/libretime,justvanbloom/airtime,thnkloud9/Airtime,sourcefabric/Airtime,radiorabe/airtime,LibreTime/libretime,justvanbloom/airtime,Lapotor/libretime,sourcefabric/Airtime,ReganDryke/airtime,LibreTime/libretime,LibreTime/libretime,comiconomenclaturist/libretime,sourcefabric/airtime,radiorabe/airtime,radiorabe/airtime,thnkloud9/Airtime,sourcefabric/Airtime,LibreTime/libretime,Lapotor/libretime,radiorabe/airtime,justvanbloom/airtime,ReganDryke/airtime,comiconomenclaturist/libretime,ReganDryke/airtime,sourcefabric/Airtime,Ryex/airtime,thnkloud9/Airtime,Ryex/airtime,sourcefabric/airtime,thnkloud9/Airtime,sourcefabric/airtime,comiconomenclaturist/libretime,Ryex/airtime,thnkloud9/Airtime,sourcefabric/airtime,justvanbloom/airtime,comiconomenclaturist/libretime,comiconomenclaturist/libretime,ReganDryke/airtime,Lapotor/libretime