Don't crash when WearNTear doesn't have a Piece. Addresses #12

XPortal/HarmonyPatches.cs

@@ -178,6 +178,7 @@ static void Postfix(Piece ___m_piece, ZNetView ___m_nview)
                     var portalZDO = ___m_nview.GetZDO();
                     if (portalZDO == null)
                     {
+                        Jotunn.Logger.LogError("A portal was placed but the ZDO is not available");
                         return;
                     }
 
@@ -196,11 +197,23 @@ static class WearNTearDestroyPatch
             /// <summary>
             /// Before destroying a piece, check if it's a portal, and if so, raise event OnPortalDestroyed
             /// </summary>
-            static void Prefix(Piece ___m_piece, ZNetView ___m_nview)
+            static void Prefix(WearNTear __instance)
             {
-                if (___m_piece.m_name.Equals("$piece_portal") && ___m_piece.CanBeRemoved() && ___m_nview != null)
+                var piece = __instance.m_piece;
+                if (piece == null)
                 {
-                    var portalZDO = ___m_nview.GetZDO();
+                    return;
+                }
+
+                var nview = piece.m_nview;
+                if (nview == null)
+                {
+                    return;
+                }
+
+                if (piece.m_name.Equals("$piece_portal") && piece.CanBeRemoved())
+                {
+                    var portalZDO = nview.GetZDO();
                     if (portalZDO == null)
                     {
                         return;