can DYNAMIC_ARRAY set its first argument to NULL?

Hi Bruno,

Can

--8<---------------cut here---------------start------------->8---
DYNAMIC_ARRAY(prompt,char,Sbvector_length(lastline)+1);
--8<---------------cut here---------------end--------------->8---

set prompt to NULL?

we test it for being NULL in rd_ch_terminal3 (and clang complains), but
everywhere else we seem to assume that it is non-NULL.

Thanks.

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