Fix to document loading issue with collection modification exception.

inabox.database.sqlite/SQLiteProvider.cs

@@ -2399,9 +2399,12 @@ namespace InABox.Database.SQLite
                 if (prop is not null && prop.HasAttribute<ExternalStorageAttribute>())
                 {
                     blobColumns.Add(column);
-                    cols.Add("ID");
                 }
             }
+            if(blobColumns.Count > 0)
+            {
+                cols.Add("ID");
+            }
 
             var result = new CoreTable(T.EntityName());
             foreach (var col in cols.GetColumns())