[ISSUE #7199] grpcClientChannel header add null judgement

[weihubeats]

#7199

[codecov-commenter]

Codecov Report

Merging #7238 (dae83ec) into develop (82b2f8e) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##             develop    #7238      +/-   ##
=============================================
- Coverage      42.97%   42.94%   -0.03%     
+ Complexity      9670     9661       -9     
=============================================
  Files           1161     1161              
  Lines          83926    83926              
  Branches       10898    10898              
=============================================
- Hits           36069    36045      -24     
- Misses         43380    43403      +23     
- Partials        4477     4478       +1     

Files	Coverage Δ
...ketmq/proxy/grpc/v2/channel/GrpcClientChannel.java	53.70% <0.00%> (ø)

... and 32 files with indirect coverage changes

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[weihubeats]

@Oliverwqcwrw Can you look at this pr?

[Oliverwqcwrw]

Although I don't think the header should be null in theory, it is necessary for the robustness of the code to add this null judgment.

[weihubeats]

@RongtongJin Can you help merge this pr

[weihubeats]

@Oliverwqcwrw Can you help merge this pr

[weihubeats]

@RongtongJin Can you help merge this pr

[github-actions]

This PR is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this PR.

[weihubeats]

@Oliverwqcwrw Can you look at this pr?

[Oliverwqcwrw]

@Oliverwqcwrw Can you look at this pr?

Thanks for your contribution