Registered MBean doesn't have any attributes

[takezoe]

No description provided.

[codecov]

Codecov Report

Merging #2464 (64eef9f) into master (9514866) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2464      +/-   ##
==========================================
+ Coverage   81.88%   81.92%   +0.03%     
==========================================
  Files         331      331              
  Lines       13561    13560       -1     
  Branches     2099     2101       +2     
==========================================
+ Hits        11105    11109       +4     
+ Misses       2456     2451       -5     

Impacted Files	Coverage Δ
...rc/main/scala/wvlet/airframe/jmx/JMXRegistry.scala	85.18% <ø> (-0.53%)	⬇️
...c/main/scala/wvlet/airframe/surface/Surfaces.scala	85.08% <0.00%> (+0.87%)	⬆️
...x/src/main/scala/wvlet/airframe/jmx/JMXMBean.scala	68.85% <0.00%> (+3.27%)	⬆️
...main/scala/wvlet/airframe/jmx/MBeanParameter.scala	100.00% <0.00%> (+50.00%)	⬆️

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