[#6821] Fix servermap instance list factory

[jaehong-kim]

#6821

When there is no transaction information, agentInfo information is used.

[codecov]

Codecov Report

Merging #8447 (163ad27) into master (3a919fa) will decrease coverage by 0.00%.
The diff coverage is 7.69%.

@@             Coverage Diff              @@
##             master    #8447      +/-   ##
============================================
- Coverage     39.76%   39.75%   -0.01%     
+ Complexity    11406    11396      -10     
============================================
  Files          3352     3352              
  Lines         89506    89512       +6     
  Branches       9922     9924       +2     
============================================
- Hits          35589    35583       -6     
  Misses        50867    50867              
- Partials       3050     3062      +12     

Impacted Files	Coverage Δ
...er/server/StatisticsServerInstanceListFactory.java	0.00% <0.00%> (ø)
...navercorp/pinpoint/web/service/MapServiceImpl.java	0.00% <0.00%> (ø)
.../web/service/ResponseTimeHistogramServiceImpl.java	0.00% <0.00%> (ø)
...p/pinpoint/web/service/FilteredMapServiceImpl.java	61.97% <50.00%> (ø)
...vercorp/pinpoint/rpc/packet/ServerClosePacket.java	47.82% <0.00%> (-17.40%)	⬇️
...rc/main/java/com/navercorp/pinpoint/test/Item.java	68.51% <0.00%> (-7.41%)	⬇️
...rp/pinpoint/rpc/server/PinpointServerAcceptor.java	84.10% <0.00%> (-4.64%)	⬇️
...navercorp/pinpoint/rpc/common/SocketStateCode.java	81.25% <0.00%> (-3.13%)	⬇️
...ollector/cluster/zookeeper/ZookeeperJobWorker.java	75.60% <0.00%> (-2.44%)	⬇️
...point/rpc/client/DefaultPinpointClientHandler.java	71.83% <0.00%> (-1.41%)	⬇️
... and 7 more

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