fix: nil pointer in create analysisrun cmd

[huikang]

Signed-off-by: Hui Kang [email protected]

Checklist:

fix #1398

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #1399 (9d6b3c9) into master (2620490) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1399      +/-   ##
==========================================
+ Coverage   81.22%   81.27%   +0.05%     
==========================================
  Files         108      108              
  Lines        9916     9951      +35     
==========================================
+ Hits         8054     8088      +34     
  Misses       1309     1309              
- Partials      553      554       +1     

Impacted Files	Coverage Δ
pkg/kubectl-argo-rollouts/cmd/create/create.go	65.58% <100.00%> (+0.16%)	⬆️
rollout/analysis.go	80.75% <100.00%> (+0.14%)	⬆️
rollout/experiment.go	85.71% <100.00%> (+0.18%)	⬆️
utils/analysis/filter.go	97.93% <100.00%> (+0.46%)	⬆️
utils/defaults/defaults.go	92.00% <100.00%> (+0.69%)	⬆️
utils/experiment/filter.go	100.00% <100.00%> (ø)
rollout/canary.go	76.41% <0.00%> (-2.06%)	⬇️
rollout/bluegreen.go	70.91% <0.00%> (ø)
rollout/sync.go	76.63% <0.00%> (+0.16%)	⬆️
pkg/apis/rollouts/validation/validation.go	97.14% <0.00%> (+2.27%)	⬆️

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