skip close when linter mode is None

src/server.rs

@@ -255,11 +255,12 @@ impl LanguageServer for Backend {
 
     async fn did_close(&self, params: DidCloseTextDocumentParams) {
         // 获取诊断相关的配置信息，如果 mode 为 common，则需要清空关闭文件的诊断信息
-        let linter_mode = self.server.db.get_lsp_configuration_string_value("digital-ide.function.lsp.linter.mode").unwrap();
+        if let Some(linter_mode) = self.server.db.get_lsp_configuration_string_value("digital-ide.function.lsp.linter.mode") {
             if linter_mode == "common" {
                 self.client.publish_diagnostics(params.text_document.uri, vec![], None).await;               
             }
         }
+    }
     
     async fn did_change(&self, params: DidChangeTextDocumentParams) {
         // // 如果文件太大则显示错误