fixed #9592: DataForm deleteAttachedFiles method can crash

docs/changelog/7.x.x.txt

@@ -1,6 +1,7 @@
 7.6.11
  - fixed: Syndicated Content asset doesn't work with feeds that specify their encodings via HTTP headers
  - fixed #9375: Syndicated Content asset improperly decodes wide XML entities
+ - fixed #9592: DataForm deleteAttachedFiles method can crash
 
 7.6.10
  - fixed #9577: WebGUI::Form::Url::getValue returns blank rather than undef for blank fields

lib/WebGUI/Asset/Wobject/DataForm.pm

@@ -484,7 +484,9 @@ sub deleteAttachedFiles {
             my $form = $self->_createForm($fieldConfig->{$field}, $entryData->{$field});
             if ($form->can('getStorageLocation')) {
                 my $storage = $form->getStorageLocation;
-                $storage->delete;
+                if ($storage) {
+                    $storage->delete;
+                }
             }
         }
     }