Fix null check for component with 4+ properties in hql

[bahusoid]

Fixes #2822

Just ported hibernate version https://github.com/hibernate/hibernate-orm/blob/ee55768587abc2893d26fca1915ac32e86242fa2/hibernate-core/src/main/java/org/hibernate/hql/internal/ast/tree/AbstractNullnessCheckNode.java#L72-L88

[hazzik]

Just ported hibernate version

Which is extremely hard to comprehend.

[bahusoid]

Our version is not much cleaner. Main difference - our version creates nested elements and hibernate siblings elements. Seems nesting is a problem (though didn't really check)