fix null ref during load

Author: hippiehunter

HarmonyCoreCodeGen.Core/Model/Solution.dbl

@@ -1374,7 +1374,7 @@ namespace HarmonyCoreGenerator.Model
 
             data context = new CodeGenContext(taskSet)
             context.ExtendedRepositoryProperties = GetExtendedStructureProperties()
-            
+
             ;;compiler bug
             ;;context.Structures = new RpsStructureCollection(RpsLoadMode.Load, AlternateFieldNames ?? false)
             ;;internal compiler error
@@ -1383,6 +1383,9 @@ namespace HarmonyCoreGenerator.Model
             if(AlternateFieldNames.HasValue)
                 altFieldNames = AlternateFieldNames.Value
 
+            if(context.Repository == ^null)
+                context.Repository = RPS
+
 			context.Structures = new RpsStructureCollection(context.Repository,RpsLoadMode.Load,altFieldNames)
 			context.Properties.TryAdd(^typeof(HarmonyCoreExtensions.Helpers.RelationLookup), new HarmonyCoreExtensions.Helpers.RelationLookup(context.Structures, loadedRelations))
 			;;create code generator