Use Bname="" for condition evaluation (#1305)

[grasci-arm]

Bname is set to explicit empty string if device is selected, but no board is specified
The filters-out all board-specific pack items that has conditions with Bname

Fixes Open-CMSIS-Pack/ST_B-U585I-IOT02A_BSP#5

[github-actions]

Test Results

  6 files   12 suites   13s ⏱️
 48 tests  48 ✅ 0 💤 0 ❌
144 runs  144 ✅ 0 💤 0 ❌

Results for commit 94b35b9.

[github-actions]

Test Results

  7 files   53 suites   6m 4s ⏱️
185 tests 168 ✅ 17 💤 0 ❌
692 runs  624 ✅ 68 💤 0 ❌

Results for commit 94b35b9.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.62%. Comparing base (a7630ea) to head (94b35b9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2197   +/-   ##
=======================================
  Coverage   66.62%   66.62%           
=======================================
  Files         181      181           
  Lines       38514    38514           
  Branches    22581    22581           
=======================================
  Hits        25661    25661           
+ Misses       8086     8058   -28     
- Partials     4767     4795   +28     

Flag	Coverage Δ
buildmgr-cov	73.95% <ø> (ø)
packchk-cov	70.18% <ø> (ø)
projmgr-cov	80.75% <ø> (ø)

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see 12 files with indirect coverage changes

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