[#noissue] Guard NPE while processing phone number

[smilu97]

Adds null-checking before removing hyphen in phone number

[codecov]

Codecov Report

Merging #9050 (0a65ab7) into master (5e5e57a) will increase coverage by 0.00%.
The diff coverage is 71.42%.

@@            Coverage Diff            @@
##             master    #9050   +/-   ##
=========================================
  Coverage     39.78%   39.79%           
  Complexity    11828    11828           
=========================================
  Files          3365     3365           
  Lines         90937    90938    +1     
  Branches      10090    10090           
=========================================
+ Hits          36181    36187    +6     
+ Misses        51658    51654    -4     
+ Partials       3098     3097    -1     

Impacted Files	Coverage Δ
...orp/pinpoint/web/service/UserGroupServiceImpl.java	39.70% <71.42%> (+3.88%)	⬆️
...p/pinpoint/rpc/client/WriteFailFutureListener.java	56.25% <0.00%> (-25.00%)	⬇️
...vercorp/pinpoint/rpc/packet/ClientClosePacket.java	46.66% <0.00%> (-6.67%)	⬇️
...orp/pinpoint/rpc/server/DefaultPinpointServer.java	79.83% <0.00%> (-1.24%)	⬇️
...r/context/storage/AsyncQueueingUriStatStorage.java	85.29% <0.00%> (+16.17%)	⬆️

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