Fix a bug in the UpgradesBugs patch where the upgrades field on a Par…

…tModule could be left null in some cases. This is true only for PartModules that are added via code, and only on the prefab itself it appears.

KSPCommunityFixes/BugFixes/UpgradeBugs.cs

@@ -15,6 +15,11 @@ public class UpgradeBugs : BasePatch
 
         protected override void ApplyPatches(List<PatchInfo> patches)
         {
+            patches.Add(new PatchInfo(
+                PatchMethodType.Postfix,
+                AccessTools.Constructor(typeof(PartModule)),
+                this, "PartModule_ctor_Postfix"));
+
             patches.Add(new PatchInfo(
                 PatchMethodType.Prefix,
                 AccessTools.Method(typeof(PartListTooltip), nameof(PartListTooltip.SetupUpgradeInfo)),
@@ -72,6 +77,11 @@ protected override void ApplyPatches(List<PatchInfo> patches)
                 "GetUsedBy_Prefix"));
         }
 
+        static void PartModule_ctor_Postfix(PartModule __instance)
+        {
+            __instance.upgrades = new List<ConfigNode>();
+        }
+
         // This was doing weird stuff with PartStatsUpgradeModules where it only applied its upgrades' costs.
         // and added an extendedInfo entry for just that.
         // We'll handle everything in CreateExtendedInfo instead.