Fix: ui_context: crmsh still complete even for unknown command

[liangxin1300]

Fix issue #1613

• Don't complete for unknown command
• Don't complete for unknown arguments

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 69.20%. Comparing base (ae21432) to head (9c308b2).

Files with missing lines	Patch %	Lines
crmsh/ui_context.py	0.00%	6 Missing ⚠️

Additional details and impacted files

Flag	Coverage Δ
integration	54.42% <0.00%> (-0.01%)	⬇️
unit	52.12% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
crmsh/ui_context.py	57.35% <0.00%> (-0.88%)	⬇️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.