fix(antd/next): fix array-collapse onAdd function nullable issue (#3795)

Author: McDaddy

packages/antd/src/array-collapse/index.tsx

@@ -210,7 +210,7 @@ export const ArrayCollapse: ComposedArrayCollapse = observer((props) => {
   return (
     <ArrayBase
       onAdd={(index) => {
-        onAdd(index)
+        onAdd?.(index)
         setActiveKeys(insertActiveKeys(activeKeys, index))
       }}
       onCopy={onCopy}

packages/next/src/array-collapse/index.tsx

@@ -209,7 +209,7 @@ export const ArrayCollapse: ComposedArrayCollapse = observer(
     return (
       <ArrayBase
         onAdd={(index) => {
-          onAdd(index)
+          onAdd?.(index)
           setExpandKeys(insertExpandedKeys(expandKeys, index))
         }}
         onCopy={onCopy}