Fixed errors in netlobbyscreen when attempting to select a sub that fails to load (for example due to a missing/corrupt file), campaign cannot be started if the selected submarine cannot be loaded

Barotrauma/BarotraumaClient/Source/Screens/CampaignSetupUI.cs

@@ -57,6 +57,14 @@ namespace Barotrauma
                 
                 Submarine selectedSub = subList.SelectedData as Submarine;
                 if (selectedSub == null) return false;
+                
+                if (string.IsNullOrEmpty(selectedSub.MD5Hash.Hash))
+                {
+                    ((GUITextBlock)subList.Selected).TextColor = Color.DarkRed * 0.8f;
+                    subList.Selected.CanBeFocused = false;
+                    subList.Deselect();
+                    return false;
+                }
 
                 string savePath = SaveUtil.CreateSavePath(isMultiplayer ? SaveUtil.SaveType.Multiplayer : SaveUtil.SaveType.Singleplayer, saveNameBox.Text);
                 if (selectedSub.HasTag(SubmarineTag.Shuttle) || !selectedSub.CompatibleContentPackages.Contains(GameMain.SelectedPackage.Name))

Barotrauma/BarotraumaClient/Source/Screens/NetLobbyScreen.cs

@@ -737,10 +737,11 @@ namespace Barotrauma
             //hash will be null if opening the sub file failed -> don't select the sub
             if (string.IsNullOrWhiteSpace(hash))
             {
-                if (component is GUITextBlock textBlock)
+                GUITextBlock submarineTextBlock = component.GetChild<GUITextBlock>();
+                if (submarineTextBlock != null)
                 {
-                    textBlock.TextColor = Color.DarkRed * 0.8f;
-                    textBlock.CanBeFocused = false;
+                    submarineTextBlock.TextColor = Color.DarkRed * 0.8f;
+                    submarineTextBlock.CanBeFocused = false;
                 }
                 else
                 {