Behavior when no legal comment is included

[TomokiMiyauci]

If legalComments is link or external and the file has no legal comments, an empty entry is output.

This may result in a large number of empty files in some cases.

Why not make it the standard behavior to output nothing if the file does not contain a legal comment?

I don't think we need a new option to control this, what do you think?

[martinpitt]

Indeed in our cockpit project, esbuild generates 61 *.LEGAL.txt files, of which 40 are empty (zero bytes). This mostly applies to *.css files, but there are *.js as well.