logger broke after empty message

[centralhardware]

if i execute code

INFO ""
after this logging, neither the console nor the file works

[idelsink]

This is 'by design'. Currently it checks if the variable with the message is empty and when it is, it waits for stdin. The string "" is an empty string and the -z option checks for an empty string.

See: https://github.com/idelsink/b-log/blob/master/b-log.sh#L313

Thanks for the issue tho, but I'm not sure if this should be 'fixed'.

[centralhardware]

In any case, this should be reflected in the readm, and ideally it would be possible to show warning when using