Print literal value instead of crashing on missing text annotation

[richcarl]

This allows you to format syntax trees that have been synthesized outside erlfmt without forcing the caller to add "text" annotations for all literals in order to print them.

[awalterschulze]

Would it be possible to parse the AST and transform it to include these "text" annotations, before passing it back to erlfmt?

Or include a test with an explanation comment, so that we do not simplify this code later by accident?

[richcarl]

It is of course possible, just a bit annoying and expensive to do an extra pass rewriting the whole AST for this.

[awalterschulze]

If it is too much effort to have an extra pass over the AST, consider adding a test, with a comment that explains why this is necessary, to make sure we do not regress and remove this change when thinking we are cleaning things up.

[awalterschulze]

This is probably go to merge, just need a test. Do you want to add a test or maybe we can add one for you?