fixed provider set delay NullPointerException

[Leishunyu]

What is the purpose of the change

#3952

fixed this bug

Brief changelog

provider's delay has not set in serviceconfig

Verifying this change

set provider's delay in serviceconfig

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[codecov-io]

Codecov Report

Merging #3957 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master   #3957      +/-   ##
===========================================
- Coverage     63.97%   63.9%   -0.07%     
  Complexity       98      98              
===========================================
  Files           713     713              
  Lines         31481   31482       +1     
  Branches       5076    5076              
===========================================
- Hits          20139   20118      -21     
- Misses         9038    9055      +17     
- Partials       2304    2309       +5

Impacted Files	Coverage Δ	Complexity Δ
...in/java/org/apache/dubbo/config/ServiceConfig.java	58.17% <100%> (+0.08%)	0 <0> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	64.1% <0%> (-17.95%)	0% <0%> (ø)
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyClientHandler.java	61.4% <0%> (-7.02%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	79.69% <0%> (-1.92%)	0% <0%> (ø)
...che/dubbo/remoting/transport/mina/MinaChannel.java	53.94% <0%> (-1.32%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	73.46% <0%> (ø)	0% <0%> (ø)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	71.73% <0%> (ø)	0% <0%> (ø)	⬇️

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[beiwei30]

LGTM. I will follow up to make it better, since I also need to take care shouldExport too. Thanks.

the change looks good enough.

[ralf0131]

LGTM. I will follow up to make it better, since I also need to take care shouldExport too. Thanks.

This change does not look good to me. Why it is getting merged?
How would you planning to improve it?

[beiwei30]

@ralf0131 @Leishunyu pls. review #3959

[ralf0131]

The pull request looks good to me.
IMO, it would be better to let @Leishunyu to improve it.