[Patch] PR92990 - fix error message for invalid argument of NULLIFY

[Thomas Koenig]

Am 20.12.19 um 22:33 schrieb Harald Anlauf:
> The fix for PR70853 changed an ICE-on-invalid for NULLIFY into a
> misleading error message.  The patch below rectifies that.
> 
> OK for trunk?

OK.

Thanks for the patch!

Regards

	Thomas