修复我的信息界面未选中文件删除的BUG，v1.7.12

ClientsLibrary/AccountSupport/FormAccountDetails.cs

@@ -421,6 +421,8 @@ namespace ClientsLibrary
         private void userButton2_Click(object sender, EventArgs e)
         {
             // 删除选中文件
+            if (treeView1.SelectedNode == null) return;
+
             TreeNode treeNode = treeView1.SelectedNode;
             if (treeNode.Name != "files_root")
             {

CommonLibrary/UserSystem.cs

@@ -44,7 +44,7 @@ namespace CommonLibrary
              **************************************************************************/
 
 
-            SoftBasic.FrameworkVersion = new SystemVersion("1.7.11");
+            SoftBasic.FrameworkVersion = new SystemVersion("1.7.12");
 
         }