tracker-extract, albumart: Don't assume that g_file_get_parent() returns non-NULL
tracker-extract, albumart: Don't assume that g_file_get_parent() returns non-NULL

hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker