GF 2.5 compatibility: GFListFieldSortable::requires_scripts()

ErrorException: Warning: Invalid argument supplied for foreach()
Notice: Undefined index: fields

Sentry traceback https://sentry.io/share/issue/6dc4c5ba23cb41cd84140206f4fe56f1/

Although I can see this plugin has been deadpooled, maybe it’s still worth it fixing it up, until people can migrate away.