fix loading to world without mods not triggering download

Plugin.ClientModLoader/ModInjector.cs

@@ -44,6 +44,22 @@ internal static class ModInjector
                 __state.Add(mod);
         }
     }
+
+    [HarmonyPatch(typeof(MyWorkshop), nameof(MyWorkshop.DownloadModsAsync))]
+    [HarmonyTranspiler]
+    private static IEnumerable<CodeInstruction> DownloadModsAsyncTranspiler(IEnumerable<CodeInstruction> instructions)
+    {
+        var getCount = AccessTools.PropertyGetter(typeof(List<MyObjectBuilder_Checkpoint.ModItem>), nameof(List<MyObjectBuilder_Checkpoint.ModItem>.Count));
+        return new CodeMatcher(instructions)
+            .SearchForward(b => b.Calls(getCount))
+            .Advance(1)
+            .Insert(
+                CodeInstruction.LoadField(typeof(ModInjector), nameof(Mods)),
+                new(OpCodes.Callvirt, AccessTools.PropertyGetter(typeof(HashSet<ulong>), nameof(HashSet<ulong>.Count))),
+                new(OpCodes.Add)
+            )
+            .Instructions();
+    }
     
     [HarmonyPatch(typeof(MyDefinitionManager), nameof(MyDefinitionManager.LoadData))]
     [HarmonyPrefix]