dartdoc_options errors in package dependencies can block doc generation #3374
Description
#3365 revealed that since null safety, there's no way for dartdoc_options to ignore type errors in dartdoc_options files. #3372 improved the situation by not crashing and displaying an error, but if the package owner is depending on a package that has the problem they may have trouble correcting the situation themselves.
Some way to ignore invalid dartdoc_options files if they're not in the package being documented would be nice.