[bug #68558] [PATCH] [troff] assertion failure in `do` request handler when given an invalid identifier

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Follow-up Comment #3, bug #68558 (group groff):=0A=0A[comment #2 comment #2=
:]=0A> Problem appears to date=0A> back at least to groff 1.22.3 (2014), an=
d possibly much earlier.=0A=0ALess than 10 years earlier, FWIW.  (1.19.2 da=
tes to 2005.)=0A=0A$ groff -v | head -1=0AGNU groff version 1.19.2=0A$ prin=
tf '.do \\a\n' | groff && echo exit success=0A<standard input>:1: name expe=
cted (got a node): treated as missing=0Aexit success=0A=0A=0A=0A=0A    ____=
___________________________________________________=0A=0AReply to this item=
 at:=0A=0A  <https://savannah.gnu.org/bugs/?68558>=0A=0A___________________=
____________________________=0AMessage sent via Savannah=0Ahttps://savannah=
.gnu.org/=0A
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