Merge pull request #243 from DataObjects-NET/catalog-cloner-fix

No more NRE on Views cloning in CatalogCloner

Author: alex-kulakov

ChangeLog/6.0.10_dev.txt

@@ -0,0 +1 @@
+[main] Fixed certain cases of NRE happened on Domain build due to views in extracted schema

Orm/Xtensive.Orm/Orm/Upgrade/Internals/CatalogCloner.cs

@@ -157,7 +157,9 @@ private void CloneViews(Schema newSchema, Schema sourceSchema)
         var newView = newSchema.CreateView(sourceView.Name);
         CopyDbName(newView, sourceView);
         newView.CheckOptions = sourceView.CheckOptions;
-        newView.Definition = (SqlNative) sourceView.Definition.Clone();
+        if (sourceView.Definition != null) {
+          newView.Definition = (SqlNative) sourceView.Definition.Clone();
+        }
         CloneViewColumns(newView, sourceView);
         CloneIndexes(newView, sourceView);
       }