FIX Don't return invalid value (#453)

GuySartorelli · web-flow · commit fcb9c46bca77 · 2025-08-12T15:06:23.000+12:00
If there's no record that should be a 404. Returning empty string is
invalid for this method so would have been a 500!
diff --git a/src/GridFieldNestedForm.php b/src/GridFieldNestedForm.php
@@ -367,7 +367,7 @@ public function handleNestedItem(
             $record = $list->byID($recordID);
         }
         if (!$record) {
-            return '';
+            throw new HTTPResponse_Exception(statusCode: 404);
         }
         $relationName = $this->getRelationName();
         if (!$record->hasMethod($relationName)) {

Original file line number	Diff line number	Diff line change
`@@ -367,7 +367,7 @@ public function handleNestedItem(`
`367`	`367`	`$record = $list->byID($recordID);`
`368`	`368`	`}`
`369`	`369`	`if (!$record) {`
`370`		`- return '';`
	`370`	`+ throw new HTTPResponse_Exception(statusCode: 404);`
`371`	`371`	`}`
`372`	`372`	`$relationName = $this->getRelationName();`
`373`	`373`	`if (!$record->hasMethod($relationName)) {`