avoid nil subgroups

changelog.txt

@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.2.14
+Date: 2024-02-07
+  Fixes:
+    - Attempt to fix a rare compatibility issue related to indexing nil value
+---------------------------------------------------------------------------------------------------
 Version: 0.2.13
 Date: 2023-12-28
   Changes:

info.json

@@ -1,6 +1,6 @@
 {
     "name": "bzfoundry",
-    "version": "0.2.13",
+    "version": "0.2.14",
     "factorio_version": "1.1",
     "title": "Foundry",
     "author": "Brevven",

refractory-updates.lua

@@ -101,7 +101,7 @@ function make_recipe(recipe)
     r.result_count = nil
     r.enabled = false
     r.category = recipe.category == "casting" and "casting" or "founding"
-    r.subgroup = data.raw.item[found_result].subgroup
+    r.subgroup = data.raw.item[found_result] and data.raw.item[found_result].subgroup or "foundry-intermediate"
     icons = rusty_icons.of(data.raw.recipe[recipe.name])
     table.insert(
         icons,