👌 IMPROVE: Warning message for group with no entry point

[chrisjsewell]

fixes #3919

[codecov]

Codecov Report

Merging #5076 (da3d0cf) into develop (c041163) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #5076      +/-   ##
===========================================
+ Coverage    80.47%   80.47%   +0.01%     
===========================================
  Files          531      531              
  Lines        36950    36951       +1     
===========================================
+ Hits         29731    29732       +1     
  Misses        7219     7219              

Flag	Coverage Δ
django	74.99% <100.00%> (+0.01%)	⬆️
sqlalchemy	73.89% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
aiida/orm/groups.py	94.74% <100.00%> (+0.05%)	⬆️

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