fix: empty name default on create

[lkingland]

#3113 should also support the name being optional

[knative-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.05%. Comparing base (5e43734) to head (9b18430).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/create.go	63.15%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3127      +/-   ##
==========================================
+ Coverage   58.33%   59.05%   +0.72%     
==========================================
  Files         134      134              
  Lines       17367    17382      +15     
==========================================
+ Hits        10131    10265     +134     
+ Misses       6298     6148     -150     
- Partials      938      969      +31     

Flag	Coverage Δ
e2e-tests	40.26% <63.15%> (+1.33%)	⬆️
integration-tests	53.91% <63.15%> (+1.63%)	⬆️
unit-tests	46.22% <63.15%> (-0.01%)	⬇️

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