DTD parse errors not detected

[Jeroen T. Vermeulen]

When a DTD file inside an XPI archive has parse errors, the parser does not generate an error. I haven't studied the details, but it looks like it will just parse what it can and ignore what it can't. This is because the parser uses the ErrorCounter error handler, which quietly counts errors and does nothing else about them.

This came up as part of the work on the poimport-error-reports branch. A fix is included there.

[Jeroen T. Vermeulen (jtv)]

Fixed in RF 8155