If no source is found.... at least return name being sent via command line

[valentinedwv]

{"file":"/home/runner/work/gleaner/gleaner/cmd/gleaner/main.go:127","func":"main.main","level":"error","msg":"CAUTION: no matching source, did your -source VALUE match a sources.name VALUE in your config file?","time":"2023-08-07T23:00:20Z"}

Had to debug without the name...