Two small fixes;

- ALT+R clear rotation on PoseMode didn't work when an Action was assigned
- 'Delete object' didn't set object pointers to NULL for Armature/Pose
  constraints (old bug)

source/blender/blenkernel/intern/armature.c

@@ -702,6 +702,7 @@ static void initialize_posechain(struct Object *ob, bPoseChannel *pchan_tip)
 	
 	data=(bKinematicConstraint*)con->data;
 	if(data->tar==NULL) return;
+	if(data->tar->type==OB_ARMATURE && data->subtarget[0]==0) return;
 	
 	/* Find the chain's root & count the segments needed */
 	for (curchan = pchan_tip; curchan; curchan=curchan->parent){

source/blender/blenkernel/intern/object.c

@@ -280,6 +280,17 @@ void unlink_object(Object *ob)
 					obt->recalc |= OB_RECALC;
 				}
 			}
+			else if(obt->type==OB_ARMATURE && obt->pose) {
+				bPoseChannel *pchan;
+				for(pchan= obt->pose->chanbase.first; pchan; pchan= pchan->next) {
+					for (con = pchan->constraints.first; con; con=con->next) {
+						if(ob==get_constraint_target(con, &str)) {
+							set_constraint_target(con, NULL);
+							obt->recalc |= OB_RECALC_DATA;
+						}
+					}
+				}
+			}
 			
 			sca_remove_ob_poin(obt, ob);
 			

source/blender/src/editarmature.c

@@ -2103,8 +2103,8 @@ void clear_armature(Object *ob, char mode)
 			}
 		}
 	}
-
-	DAG_object_flush_update(G.scene, ob, OB_RECALC_DATA);
+	/* no DAG flush, this will execture the action again */
+	where_is_pose (ob);
 }
 
 /* helper for function below */