Fix/disable no unsafe optional chaining (#25553)

web/.oxlintrc.json

     "no-unassigned-vars": "warn",
     "no-unsafe-finally": "warn",
     "no-unsafe-negation": "warn",
-    "no-unsafe-optional-chaining": "warn",
+    "no-unsafe-optional-chaining": "error",
     "no-unused-labels": "warn",
     "no-unused-private-class-members": "warn",
     "no-unused-vars": "warn",

web/app/components/workflow/nodes/_base/components/variable/utils.ts

       return false
 
     const obj = findExceptVarInObject(isFile ? { ...v, children } : v, filterVar, selector, isFile)
-    return obj?.children && ((obj?.children as Var[]).length > 0 || Object.keys((obj?.children as StructuredOutput)?.schema?.properties || {}).length > 0)
+    return hasValidChildren(obj?.children)
   }).map((v) => {
     const isFile = v.type === VarType.file
 
   if (isIterationInnerVar) {
     if (valueSelector[1] === 'item') {
       const itemType = getIterationItemType({
-        valueSelector: (parentNode?.data as any).iterator_selector || [],
+        valueSelector: (parentNode?.data as any)?.iterator_selector || [],
         beforeNodesOutputVars,
       })
       return itemType
   if (isLoopInnerVar) {
     if (valueSelector[1] === 'item') {
       const itemType = getLoopItemType({
-        valueSelector: (parentNode?.data as any).iterator_selector || [],
+        valueSelector: (parentNode?.data as any)?.iterator_selector || [],
         beforeNodesOutputVars,
       })
       return itemType