[patch] bugfix lb-gateway's Insert rpc nil pointer panic

[kpango]

Signed-off-by: kpango kpango@vdaas.org

Description:

bugfix, gateway panics when user didn't send request config.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.7
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.13.1

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.

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[codecov]

Codecov Report

Merging #980 (9e71269) into master (9c405ba) will increase coverage by 0.10%.
The diff coverage is 4.76%.

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
+ Coverage   14.43%   14.53%   +0.10%     
==========================================
  Files         492      493       +1     
  Lines       27843    27967     +124     
==========================================
+ Hits         4019     4065      +46     
- Misses      23585    23661      +76     
- Partials      239      241       +2     

Impacted Files	Coverage Δ
pkg/gateway/backup/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/filter/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/lb/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/meta/handler/grpc/handler.go	0.00% <0.00%> (ø)
internal/safety/safety.go	95.65% <100.00%> (+0.19%)	⬆️
internal/worker/worker.go	82.29% <0.00%> (-1.05%)	⬇️
internal/net/net.go	73.77% <0.00%> (ø)
internal/worker/queue.go	100.00% <0.00%> (+1.66%)	⬆️

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[kpango]

@rinx Thank you for review, I resolved all suggestion.

[rinx]

Maybe others okay.

[kpango]

I'm going to merge & release this PR after all build succeed.