处理bug 对比库不能加载第2次的bug

OTSPartA_STDEditor/ReferenceLibrary.cs

@@ -115,6 +115,7 @@ namespace OTSPartA_STDEditor
                 DataSet ds = new DataSet();
                 m_dataAdapter.Fill(ds);
                 DataTable dt = ds.Tables[0];
+                ReferenceGroup.Clear();
                 STDDictionary.Clear();
                 if (dt != null)
                 {