Fix COALESCE search
Fix COALESCE search

We do COALESCE for some columns and operators to be able to match a
description with a regexp search for '.*' even when it is NULL. We also
did this for the equal operator (=) which proved to be less successfull,
thus backing out that change.

In a way, part of #191
Also part of #48, where we back out a bit of the change that fixed it.

bbaja42/NIPAP,bbaja42/NIPAP,SoundGoof/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,fredsod/NIPAP,garberg/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,SpriteLink/NIPAP,plajjan/NIPAP,ettrig/NIPAP,SpriteLink/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,ettrig/NIPAP,SpriteLink/NIPAP,plajjan/NIPAP,garberg/NIPAP,SoundGoof/NIPAP,plajjan/NIPAP,SpriteLink/NIPAP,ettrig/NIPAP,ettrig/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,fredsod/NIPAP,garberg/NIPAP,garberg/NIPAP,SpriteLink/NIPAP,SoundGoof/NIPAP,fredsod/NIPAP,fredsod/NIPAP,bbaja42/NIPAP,plajjan/NIPAP,SoundGoof/NIPAP,garberg/NIPAP