no redisplay after error

[David Vinayak Wallace <Gumby at MIT-MC>]

In Symbolics 3600 Zwei in System 242.356, Hardcopy 20.10, FEP 18, on Lisp Machine Apiary-4:

If I get an error (e.g. writing a file to a host that momentarily fails
to respond) and proceed it, zwei files to notice that the screen must be
updated.