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 37.50000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.14%. Comparing base (7125924) to head (c4a0331).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/create.go	37.50%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3127      +/-   ##
==========================================
+ Coverage   59.39%   60.14%   +0.74%     
==========================================
  Files         134      134              
  Lines       13495    13500       +5     
==========================================
+ Hits         8016     8120     +104     
+ Misses       4538     4408     -130     
- Partials      941      972      +31     

Flag	Coverage Δ
e2e-tests	41.68% <37.50%> (+1.44%)	⬆️
integration-tests	54.67% <37.50%> (+1.67%)	⬆️
unit-tests	46.71% <37.50%> (-0.02%)	⬇️

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[jrangelramos]

/lgtm