Fixed bug CORE-4005 : wrong error message with recursive CTE

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58384 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed segfault when releasing IMessageMetadata, reported by Dmitry privately. It was bad idea to return to the user interface created by plugin.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58385 65644016-39b1-43b1-bf79-96bc8fe82c15