Fix missing error message on convex hull failure

Also remove unused errors.

source/blender/bmesh/intern/bmesh_error.h

@@ -54,13 +54,8 @@ void BMO_error_clear(BMesh *bm);
 
 /*error messages*/
 enum {
-  BMERR_SELF_INTERSECTING = 1,
-  BMERR_DISSOLVEDISK_FAILED,
-  BMERR_CONNECTVERT_FAILED,
-  BMERR_WALKER_FAILED,
+  BMERR_CONNECTVERT_FAILED = 1,
   BMERR_DISSOLVEFACES_FAILED,
-  BMERR_TESSELLATION,
-  BMERR_NONMANIFOLD,
   BMERR_INVALID_SELECTION,
   BMERR_MESH_ERROR,
   BMERR_CONVEX_HULL_FAILED,

source/blender/bmesh/intern/bmesh_operators.c

@@ -44,18 +44,14 @@ static int bmo_name_to_slotcode_check(BMOpSlot slot_args[BMO_OP_MAX_SLOTS],
 
 static const char *bmo_error_messages[] = {
     NULL,
-    N_("Self intersection error"),
-    N_("Could not dissolve vert"),
     N_("Could not connect vertices"),
-    N_("Could not traverse mesh"),
     N_("Could not dissolve faces"),
-    N_("Tessellation error"),
-    N_("Cannot deal with non-manifold geometry"),
     N_("Invalid selection"),
     N_("Internal mesh error"),
+    N_("Convex hull failed"),
 };
 
-BLI_STATIC_ASSERT(ARRAY_SIZE(bmo_error_messages) + 1 == BMERR_TOTAL, "message mismatch");
+BLI_STATIC_ASSERT(ARRAY_SIZE(bmo_error_messages) == BMERR_TOTAL, "message mismatch");
 
 /* operator slot type information - size of one element of the type given. */
 const int BMO_OPSLOT_TYPEINFO[BMO_OP_SLOT_TOTAL_TYPES] = {