[bugfix] Fix nodelist compaction for single digitless nodes

[vkarak]

Fixes #2657.

[codecov-commenter]

Codecov Report

Base: 86.50% // Head: 86.54% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (c59457f) compared to base (32f9e25).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2689      +/-   ##
==========================================
+ Coverage   86.50%   86.54%   +0.03%     
==========================================
  Files          60       60              
  Lines       11123    11126       +3     
==========================================
+ Hits         9622     9629       +7     
+ Misses       1501     1497       -4     

Impacted Files	Coverage Δ
reframe/utility/__init__.py	93.38% <100.00%> (+0.44%)	⬆️
reframe/frontend/executors/policies.py	92.77% <0.00%> (+0.27%)	⬆️

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