jump over empty addon

[chengjoey]

What type of this PR

Add one of the following kinds:
/kind bugfix

What this PR does / why we need it:

jump over nil addon field

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• Erda Cloud Issue Link

Specified Reviewers:

/assign @your-reviewer

ChangeLog

Language	Changelog
🇺🇸 English	Fix the bug that jump over empty addon
🇨🇳 中文	修复了orchestrator遇到空的addon配置panic的问题

Need cherry-pick to release versions?

Add comment like /cherry-pick release/1.0 when this PR is merged.

For details on the cherry pick process, see the cherry pick requests section under CONTRIBUTING.md.

[codecov]

Codecov Report

Merging #3351 (b3ab12d) into master (076a72a) will increase coverage by 0.08%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3351      +/-   ##
==========================================
+ Coverage   17.79%   17.88%   +0.08%     
==========================================
  Files        1384     1386       +2     
  Lines      143698   144398     +700     
==========================================
+ Hits        25578    25822     +244     
- Misses     115434   115870     +436     
- Partials     2686     2706      +20     

Impacted Files	Coverage Δ
...estrator/services/deployment/deployment_context.go	12.01% <66.66%> (+2.75%)	⬆️
...e/monitor/metric/storage/elasticsearch/provider.go	14.42% <0.00%> (-3.85%)	⬇️
...odules/core/monitor/log/query/log.query.service.go	16.93% <0.00%> (-0.51%)	⬇️
modules/cmp/impl/clusters/import_cluster.go	22.30% <0.00%> (-0.24%)	⬇️
modules/core/monitor/log/query/routes.go	11.68% <0.00%> (-0.16%)	⬇️
modules/monitor/apm/topology/topology.go	27.54% <0.00%> (-0.05%)	⬇️
apistructs/pipeline.go	0.00% <0.00%> (ø)
modules/core-services/endpoints/notify_group.go	0.00% <0.00%> (ø)
...r/plugins/scheduler/executor/plugins/k8sjob/msg.go	0.00% <0.00%> (ø)
...lugins/scheduler/executor/plugins/k8sjob/k8sjob.go	24.86% <0.00%> (ø)
... and 8 more

[Effet]

empty string?

[chengjoey]

adjusted