Fix GetHierarchicalGroupName() (#1267)

[grasci-arm]

for the case the top group name is empty

[github-actions]

Test Results

  7 files   53 suites   4m 56s ⏱️
185 tests 168 ✅ 17 💤 0 ❌
692 runs  624 ✅ 68 💤 0 ❌

Results for commit 844b8e2.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.55%. Comparing base (7f1f911) to head (844b8e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2148   +/-   ##
=======================================
  Coverage   66.55%   66.55%           
=======================================
  Files         181      181           
  Lines       37566    37566           
  Branches    21891    21891           
=======================================
  Hits        25001    25001           
  Misses       8033     8033           
  Partials     4532     4532           

Flag	Coverage Δ
buildmgr-cov	73.95% <ø> (ø)
packchk-cov	70.18% <ø> (ø)
projmgr-cov	81.44% <ø> (ø)

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