fix: fixed the ArrayIndexOutOfBoundsException

[OutOfEastGate]

Fix #311

[casbin-bot]

@tangyang9464 @imp2002 please review

[codecov-commenter]

Codecov Report

Merging #314 (fb933a3) into master (783030c) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
- Coverage   69.41%   69.31%   -0.10%     
==========================================
  Files          48       48              
  Lines        2197     2200       +3     
  Branches      407      408       +1     
==========================================
  Hits         1525     1525              
- Misses        556      558       +2     
- Partials      116      117       +1     

Impacted Files	Coverage Δ
...ain/java/org/casbin/jcasbin/main/CoreEnforcer.java	77.19% <0.00%> (-0.83%)	⬇️

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[TraMiu]

@OutOfEastGate
Hi, I have used the MySQL adapter and I generated the policy with null value by INSERT INTO casbin_rule directly will null value.
Later, when I changed the value from null to true, it worked.
I want to help review this PR, but don't know how to add changes to my local Enforcer.java because it is in View Mode.
Can you show me how can I help you?

[OutOfEastGate]

@OutOfEastGate Hi, I have used the MySQL adapter and I generated the policy with null value by INSERT INTO casbin_rule directly will null value. Later, when I changed the value from null to true, it worked. I want to help review this PR, but don't know how to add changes to my local Enforcer.java because it is in View Mode. Can you show me how can I help you?

Thank you. I have added the code to check for policy, which will no longer throw an array out of bounds, but will give an exception to prompt the invalid policy. You can check if there are any other questions.

[github-actions]

🎉 This PR is included in version 1.31.2 🎉

The release is available on:

• GitHub release
• v1.31.2

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