fix: plugin select files and ai response check (#3104)

* fix: plugin select files and ai response check

* perf: text editor selector;tool call tip;remove invalid image url;

* perf: select file

* perf: drop files

packages/global/core/workflow/runtime/type.d.ts

@@ -135,6 +135,9 @@ export type DispatchNodeResponseType = {
   extensionResult?: string;
   extensionTokens?: number;
 
+  // dataset concat
+  concatLength?: number;
+
   // cq
   cqList?: ClassifyQuestionAgentItemType[];
   cqResult?: string;

packages/global/core/workflow/runtime/utils.ts

@@ -335,7 +335,12 @@ export function replaceEditorVariable({
   for (const key in allVariables) {
     const variable = allVariables[key];
     const val = variable.value;
-    const formatVal = typeof val === 'object' ? JSON.stringify(val) : String(val);
+    const formatVal = (() => {
+      if (val === undefined) return '';
+      if (val === null) return 'null';
+
+      return typeof val === 'object' ? JSON.stringify(val) : String(val);
+    })();
 
     const regex = new RegExp(`\\{\\{\\$(${variable.nodeId}\\.${variable.id})\\$\\}\\}`, 'g');
     text = text.replace(regex, formatVal);