The RollingFlatFileTraceListener is saving empty (0b) archive log files, while performing roll.
I've prepared an improvement/fix for this issue - an additional option to indicate whether to create an archive file even if it would be empty. The default value is "Always create", so the default behavior will not change.
@Chavoshi I'd be great if I could commit it and present in PR.
The funny thing is, the code regarding this functionality in the original .NET version of this library seems identical, yet empty archive files are not created, which I believe I desired for this implementation. :)