no more failing when a load error occurs

src/Core/LaunchSites/LaunchSiteManager.cs

@@ -211,6 +211,7 @@ public static void AddKSC2()
             ksc2.OpenCost = 1f;
             ksc2.SetClosed();
             ksc2.LaunchSiteIsHidden = true;
+            ksc2.isSquad = true;
 
             ksc2Instance.launchSite = ksc2;
             RegisterLaunchSite(ksc2);

src/Core/StaticObjects/StaticDatabase.cs

@@ -337,6 +337,11 @@ internal static StaticModel GetModelByName(string name)
             }
         }
 
+        internal static bool HasInstance(StaticInstance instance)
+        {
+            return instancedByUUID.ContainsKey(instance.UUID);
+        }
+
 
         internal static List<StaticInstance> GetInstancesFromModel(StaticModel model)
 		{

src/Core/StaticObjects/StaticInstance.cs

@@ -546,18 +546,25 @@ internal void Deactivate()
 
         internal void Destroy()
         {
+            if (groupCenter != null)
+            {
+                groupCenter.RemoveInstance(this);
+            }
+            if (StaticDatabase.HasInstance(this))
+            {
 
-            groupCenter.RemoveInstance(this);
-            StaticDatabase.DeleteStaticFromDB(this);
-
+                StaticDatabase.DeleteStaticFromDB(this);
+            }
             if (_mesh != null)
             {
                 GameObject.DestroyImmediate(_mesh);
             }
-            wreck.transform.parent = null;
-            GameObject.DestroyImmediate(wreck);
+            if (wreck != null)
+            {
+                wreck.transform.parent = null;
+                GameObject.DestroyImmediate(wreck);
+            }
             GameObject.DestroyImmediate(gameObject);
         }
-
     }
 }

src/KerbalKonstructs.cs

@@ -895,6 +895,12 @@ internal void LoadInstances(UrlDir.UrlConfig configurl, StaticModel model)
 
                 instance.Orientate();
 
+                if (!StaticDatabase.HasInstance(instance))
+                {
+                    instance.Destroy();
+                    continue;
+                }
+
                 AttachFacilities(instance, instanceCfgNode);
 
                 LaunchSiteManager.AttachLaunchSite(instance, instanceCfgNode);