[iip15] fix caused EVM error when the contract was not registered

[millken]

Description

if the contract is not registered, return nil to prevent the evm from throwing error

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• [] Code refactor or improvement
• [] Breaking change (fix or feature that would cause a new or changed behavior of existing functionality)
• [] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• make test
• [] fullsync
• [] Other test (please specify)

Test Configuration:

• Firmware version:
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [] My code follows the style guidelines of this project
• [] I have performed a self-review of my code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] My changes generate no new warnings
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes
• [] Any dependent changes have been merged and published in downstream modules

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[Liuhaai]

what scenario is the contract not registered

[millken]

what scenario is the contract not registered

contracts that have not applied for IIP15 are considered unregistered

EVM will check whether the contract has registered IIP15, the current SGD will return an error if it is not registered. But the error will cause EVM error too. so we cannot return error here

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
4.7% Duplication

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[codecov]

Codecov Report

Attention: 503 lines in your changes are missing coverage. Please review.

Comparison is base (e1f0636) 75.38% compared to head (47aa3a0) 76.13%.
Report is 102 commits behind head on master.

❗ Current head 47aa3a0 differs from pull request most recent head 309639a. Consider uploading reports for the commit 309639a to get more accurate results

Files	Patch %	Lines
blockindex/contractstaking/event_handler.go	67.23%	45 Missing and 13 partials ⚠️
action/protocol/staking/staking_statereader.go	69.76%	35 Missing and 17 partials ⚠️
action/protocol/execution/evm/evm.go	42.16%	47 Missing and 1 partial ⚠️
action/protocol/staking/protocol.go	33.33%	28 Missing ⚠️
...tion/protocol/staking/contractstake_bucket_type.go	0.00%	24 Missing ⚠️
blockindex/contractstaking/util.go	39.47%	22 Missing and 1 partial ⚠️
action/protocol/rewarding/fund.go	23.07%	19 Missing and 1 partial ⚠️
api/coreservice.go	69.69%	14 Missing and 6 partials ⚠️
api/websocket.go	0.00%	20 Missing ⚠️
action/protocol/execution/evm/evmstatedbadapter.go	0.00%	19 Missing ⚠️
... and 29 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3929      +/-   ##
==========================================
+ Coverage   75.38%   76.13%   +0.75%     
==========================================
  Files         303      330      +27     
  Lines       25923    28139    +2216     
==========================================
+ Hits        19541    21423    +1882     
- Misses       5360     5615     +255     
- Partials     1022     1101      +79     

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