Merge GetMissionNames to handle null campaign

project/code/LGS/ResourcePathManager.cs

@@ -114,20 +114,17 @@ public class ResourcePathManager
         return null;
     }
 
-    public List<string> GetMissionNames()
-    {
-        if (!_initialised) return null;
-
-        var names = new List<string>(_omResources.missionPathMap.Keys);
-        names.Sort();
-        return names;
-    }
-
     public List<string> GetMissionNames(string campaignName)
     {
         if (!_initialised) return null;
 
-        if (_fmResources.TryGetValue(campaignName, out var campaign))
+        if (campaignName == null || campaignName == "")
+        {
+            var names = new List<string>(_omResources.missionPathMap.Keys);
+            names.Sort();
+            return names;
+        }
+        else if (_fmResources.TryGetValue(campaignName, out var campaign))
         {
             var names = new List<string>(campaign.missionPathMap.Keys);
             names.Sort();

project/code/TMV/UI/MissionSelector.cs

@@ -77,10 +77,7 @@ public partial class MissionSelector : Control
 		_LoadButton.Disabled = true;
 
 		var campaignName = _Campaigns.GetItemText((int)idx);
-		var missionNames = (idx == 0) ?
+		var missionNames = pathManager.GetMissionNames(idx == 0 ? null : campaignName);
-			pathManager.GetMissionNames() :
-			pathManager.GetMissionNames(campaignName);
-
 		foreach (var mission in missionNames)
 		{
 			_Missions.AddItem(mission);