#620 - Fix crash loading game setup dialog

Author: ekolis

FrEee.Core.Domain/Extensions/GameEnumerableExtensions.cs

@@ -63,7 +63,7 @@ public static T FindByModID<T>(this IEnumerable<T> items, string modID)
 		return result;
 	}
 
-	public static T FindByName<T>(this IEnumerable<T> stuff, string name) where T : INamed
+	public static T? FindByName<T>(this IEnumerable<T> stuff, string? name) where T : INamed
 	{
 		return stuff.FirstOrDefault(item => item.Name == name);
 	}

FrEee.Core.Domain/Processes/Setup/GameSetup.cs

@@ -80,17 +80,13 @@ public GameSetup()
     /// The galaxy template to use.
     /// </summary>
     [DoNotSerialize]
-    public GalaxyTemplate GalaxyTemplate
+    public GalaxyTemplate? GalaxyTemplate
     {
-        get { return Mod.Current.GalaxyTemplates.FindByName(GalaxyTemplateName); }
-        set { GalaxyTemplateName = value.Name; }
+        get => Mod.Current.GalaxyTemplates.FindByName(GalaxyTemplateName);
+        set => GalaxyTemplateName = value?.Name;
     }
 
-    public string GalaxyTemplateName
-    {
-        get;
-        private set;
-    }
+    public string? GalaxyTemplateName { get; private set; }
 
     /// <summary>
     /// The name of the game. Used in save file names.