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

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

@@ -1,6 +1,5 @@
 import { BlockEnum, ErrorHandleMode } from '../../types'
-import type { NodeDefault, Var } from '../../types'
-import { getNotExistVariablesByArray } from '../../utils/workflow'
+import type { NodeDefault } from '../../types'
 import type { IterationNodeType } from './types'
 import {
   ALL_CHAT_AVAILABLE_BLOCKS,
@@ -59,19 +58,6 @@ const nodeDefault: NodeDefault<IterationNodeType> = {
       errorMessage: errorMessages,
     }
   },
-  checkVarValid(payload: IterationNodeType, varMap: Record<string, Var>, t: any) {
-    const errorMessageArr: string[] = []
-
-    const iterator_selector_warnings = getNotExistVariablesByArray([payload.iterator_selector], varMap)
-    if (iterator_selector_warnings.length)
-      errorMessageArr.push(`${t('workflow.nodes.iteration.input')} ${t('workflow.common.referenceVar')}${iterator_selector_warnings.join('、')}${t('workflow.common.noExist')}`)
-
-    return {
-      isValid: true,
-      warning_vars: iterator_selector_warnings,
-      errorMessage: errorMessageArr,
-    }
-  },
 }
 
 export default nodeDefault