bugfix discoverer nil map reference

[kpango]

Signed-off-by: kpango i.can.feel.gravity@gmail.com

Description:

resolves discoverer components bug

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[vdaas-ci]

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[codecov]

Codecov Report

Merging #745 into master will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #745   +/-   ##
=======================================
  Coverage   16.72%   16.73%           
=======================================
  Files         420      420           
  Lines       19473    19476    +3     
=======================================
+ Hits         3257     3259    +2     
- Misses      15995    15996    +1     
  Partials      221      221           

Impacted Files	Coverage Δ
pkg/discoverer/k8s/service/discover.go	0.00% <0.00%> (ø)
internal/worker/worker.go	82.29% <0.00%> (-1.05%)	⬇️
internal/worker/queue.go	100.00% <0.00%> (+5.00%)	⬆️

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