IRIS BI Architect no longer throws error message when no cube selected

[isc-pbarton]

Description

Resolves #980 (at least the "Error invoking source control" in the original issue. The "Did not find a matching mapping for "{{Cube name}}.CLS". Skipping export." error in the comment is an upstream issue fixed in IRIS 2026.1.0)

Testing

Unit test covers the change. Also manual testing:

docker compose up -d --build
docker compose exec -it iris iris session iris
do ##class(SourceControl.Git.API).Configure()
// say Yes to Decompose Productions, 1 to initialize git repo

Go to http://localhost:52774/csp/sys/sec/%25CSP.UI.Portal.Applications.Web.zen?PID=%2Fcsp%2Fuser and check "Analytics" to enable BI for the namespace.

Go to http://localhost:52774/csp/user/_DeepSee.UI.Architect.zen?$NAMESPACE=USER&CUBE=pab%20test%20cube.cube

Before this fix, I get an error popup. Now I get no error popup. Also created a cube and added it to source control to confirm no further problems.

Checklist

• This branch has the latest changes from the main branch rebased or merged.
• [N/A] Web UI has been built (any changes in git-webui/src have matching changes in git-webui/release)
• CHANGELOG.md entry added if appropriate.
• [N/A] Documentation has been/will be updated

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.33%. Comparing base (077d0f5) to head (662fe8c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1009      +/-   ##
==========================================
+ Coverage   50.47%   51.33%   +0.86%     
==========================================
  Files          23       23              
  Lines        3394     3407      +13     
==========================================
+ Hits         1713     1749      +36     
+ Misses       1681     1658      -23     

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