Fix possible crash when transitioning to Nauvis

lignumis/prototypes/content/wooden-rocket-silo.lua

@@ -115,7 +115,18 @@ local silo_ready = {
     inventory_type = "normal",
     quality_affects_inventory_size = false,
     placeable_by = { item = "provisional-rocket-silo", count = 1 },
-    health = 1000,
+    max_health = 1000,
+    resistances = {
+        {
+            type = "fire",
+            percent = 100
+        },
+        {
+            type = "explosion",
+            percent = 100
+        }
+    },
+    create_ghost_on_death = false,
     surface_conditions = {
         {
             property = "pressure",