Knights get no caitiff penalty against undead

doc/fixes3-7-0.txt

@@ -784,6 +784,7 @@ use silly names for rays (such as breath weapons) when hallucinating
 zombies groan instead of being silent
 martial arts users, sasquatches, and heroes wearing kicking boots can
 	no longer miss a monster completely with a clumsy kick
+knights get no caitiff penalty against undead
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

src/uhitm.c

@@ -268,6 +268,7 @@ check_caitiff(struct monst *mtmp)
         return;
 
     if (Role_if(PM_KNIGHT) && u.ualign.type == A_LAWFUL
+        && !is_undead(mtmp->data)
         && (!mtmp->mcanmove || mtmp->msleeping
             || (mtmp->mflee && !mtmp->mavenge))) {
         You("caitiff!");