Fixed CORE-4453 - Regression: NOT NULL constraint, declared in domain, does not work.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59665 65644016-39b1-43b1-bf79-96bc8fe82c15
Misc.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59666 65644016-39b1-43b1-bf79-96bc8fe82c15