fix: return empty list when name does not exist in getRoles function.

[shy1st]

fix: #162

[codecov-io]

Codecov Report

Merging #166 (42da984) into master (ff7a62e) will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   65.43%   65.36%   -0.07%     
==========================================
  Files          37       37              
  Lines        2022     2021       -1     
  Branches      354      354              
==========================================
- Hits         1323     1321       -2     
- Misses        594      597       +3     
+ Partials      105      103       -2     

Impacted Files	Coverage Δ
...va/org/casbin/jcasbin/rbac/DefaultRoleManager.java	80.45% <100.00%> (+0.22%)	⬆️
...rc/main/java/org/casbin/jcasbin/main/Enforcer.java	85.71% <0.00%> (-3.81%)	⬇️
src/main/java/org/casbin/jcasbin/model/Model.java	72.50% <0.00%> (-0.68%)	⬇️
src/main/java/org/casbin/jcasbin/util/Util.java	66.19% <0.00%> (+4.22%)	⬆️

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[hsluoyz]

🎉 This PR is included in version 1.7.4 🎉

The release is available on:

• GitHub release
• v1.7.4

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