The demotes cautions that parts of the SED are zero to notes.
The following wc on auto shows that we have a large number of
these.  They are benign - they occur if we use a blackbody
that does go to zero far out in the Wien tail.  They are a
minor note about the SED rather than something deserving of
raising a caution.

the number of cautions in tsuite/auto went from

Alien20:auto:wc ~gary/cloudy/cautions.txt
  5267  72721 544951 /home/gary/cloudy/cautions.txt

to

Alien20:auto:wc cautions2.txt
  3846  64015 460146 cautions2.txt