EDoc swallows errors when running with -chunks

[TheGeorge]

Describe the bug
When producing chunks, edoc swallows error messages, and only prints a message, that it failed, but not why.

The issues is here https://github.com/erlang/otp/blob/master/lib/edoc/src/edoc_doclet_chunks.erl#L119-L123

    catch _:_R:_St ->
	?debug("error: ~p\n"
	       "stacktrace:\n~p\n\n", [_R, _St]),
	{OkSet, true}
    end.

and should probably be something like this

    catch throw:{error, Line, {Fmt, Args}}:_St ->
        report(Line, File, Fmt, Args),
	{OkSet, true}
    end.

Expected behavior
Error messages are correctly forwarded to be reported.

Affected versions
current master

[garazdawi]

Putting this in "help wanted" as #5779 seems to have stalled.