Handle the case for required-but-missing element where element name is not available.


git-svn-id: http://jing-trang.googlecode.com/svn/branches/validator-nu@2364 369101cc-9a96-11dd-8e58-870c635edf7a
Don't emit "from namespace" with element names in error messages.


git-svn-id: http://jing-trang.googlecode.com/svn/branches/validator-nu@2365 369101cc-9a96-11dd-8e58-870c635edf7a