revert: https://github.com/langgenius/dify/pull/18554 (#19787)

web/app/components/workflow/nodes/answer/default.ts

@@ -1,6 +1,5 @@
 import { BlockEnum } from '../../types'
-import type { NodeDefault, Var } from '../../types'
-import { getNotExistVariablesByText } from '../../utils/workflow'
+import type { NodeDefault } from '../../types'
 import type { AnswerNodeType } from './types'
 import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/blocks'
 
@@ -32,19 +31,6 @@ const nodeDefault: NodeDefault<AnswerNodeType> = {
       errorMessage: errorMessages,
     }
   },
-  checkVarValid(payload: AnswerNodeType, varMap: Record<string, Var>, t: any) {
-    const errorMessageArr = []
-
-    const answer_warnings = getNotExistVariablesByText(payload.answer || '', varMap)
-    if (answer_warnings.length)
-      errorMessageArr.push(`${t('workflow.nodes.answer.answer')} ${t('workflow.common.referenceVar')}${answer_warnings.join('、')}${t('workflow.common.noExist')}`)
-
-    return {
-      isValid: true,
-      warning_vars: [...answer_warnings],
-      errorMessage: errorMessageArr,
-    }
-  },
 }
 
 export default nodeDefault