Fix get_downloads function
Fix get_downloads function

get_downloads would throw an error when it tried to open a file that
had already been downloaded, now it just ignores these duplicates

zestyr/lbry,lbryio/lbry,DaveA50/lbry,lbryio/lbry,lbryio/lbry,zestyr/lbry,DaveA50/lbry,zestyr/lbry