Render unknown stack properties

[hardillb]

Description

Minor UI update to handle undefined Stack properties nicely

Should be merged after

FlowFuse/driver-k8s#410

Related Issue(s)

FlowFuse/drivers-k8s#397

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.42%. Comparing base (6a2ce96) to head (b81ad57).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8838   +/-   ##
=======================================
  Coverage   78.42%   78.42%           
=======================================
  Files         474      474           
  Lines       25654    25654           
  Branches     6832     6832           
=======================================
  Hits        20118    20118           
  Misses       5536     5536           

Flag	Coverage Δ
backend	78.42% <ø> (ø)

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