fix: return False from has_role() when role_names is the empty list

[jennifer-richards]

No description provided.

[codecov]

Codecov Report

Merging #4541 (07b0fb4) into main (d3f25a6) will increase coverage by 0.00%.
The diff coverage is 86.00%.

@@           Coverage Diff           @@
##             main    #4541   +/-   ##
=======================================
  Coverage   88.43%   88.43%           
=======================================
  Files         296      296           
  Lines       39674    39679    +5     
=======================================
+ Hits        35086    35092    +6     
+ Misses       4588     4587    -1     

Impacted Files	Coverage Δ
ietf/ietfauth/utils.py	92.76% <50.00%> (+2.02%)	⬆️
ietf/doc/utils.py	88.12% <66.66%> (-0.46%)	⬇️
ietf/api/views.py	89.06% <100.00%> (+0.17%)	⬆️
ietf/doc/views_doc.py	90.88% <100.00%> (+0.34%)	⬆️
ietf/doc/views_search.py	89.44% <100.00%> (+0.20%)	⬆️
ietf/group/forms.py	91.41% <100.00%> (+0.16%)	⬆️
ietf/ipr/views.py	87.69% <100.00%> (ø)
ietf/meeting/views.py	90.78% <100.00%> (ø)
ietf/nomcom/utils.py	91.28% <100.00%> (-0.17%)	⬇️
ietf/nomcom/views.py	96.73% <100.00%> (+<0.01%)	⬆️
... and 10 more

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