file_name is also empty, so we are not gathering any information about the build output files.
patch sent on the toaster ml
patch merged to master http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=839f30486e82710b54deaa979bf69390013ec8b6 The info about the output file size can be found in the Target_image_file table.
Verified fixed in master:e58089b9d708ba176594a758580cc52c23725a5b