Fix PR13411: Comment parsing: failed assertion on unterminated verbatim block.

The assertion was wrong in case we have a verbatim block without a closing
command.

Also add tests for closing command name in a verbatim block, since now it can
be empty in such cases.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160568 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed