fix: Be a little clearer when feedback is closed (or not yet open).

[pselkirk]

Fixes #3492

[codecov]

Codecov Report

Merging #5861 (1fb9a8e) into main (62d6891) will increase coverage by 0.07%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##             main    #5861      +/-   ##
==========================================
+ Coverage   88.66%   88.73%   +0.07%     
==========================================
  Files         288      288              
  Lines       39949    39965      +16     
==========================================
+ Hits        35421    35464      +43     
+ Misses       4528     4501      -27     

Impacted Files	Coverage Δ
ietf/doc/views_doc.py	91.61% <ø> (ø)
ietf/doc/utils_search.py	81.17% <50.00%> (+0.58%)	⬆️
ietf/api/__init__.py	69.69% <100.00%> (+0.62%)	⬆️
ietf/doc/feeds.py	99.24% <100.00%> (+23.61%)	⬆️
ietf/group/views.py	90.53% <100.00%> (+<0.01%)	⬆️
ietf/meeting/models.py	85.15% <100.00%> (ø)
ietf/nomcom/forms.py	95.39% <100.00%> (ø)

... and 5 files with indirect coverage changes