[ISSUE #3395]Use isEmpty() to check whether the collection is empty or not.[ClientSessionGroupMapping]

[harshithasudhakar]

Fixes #3395

Motivation

Using isEmpty() to check whether the collection is empty or not.

Modifications

Changed "size()>0" to "isEmpty()"

Documentation

• Does this pull request introduce a new feature? (yes / no)
  No
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
  Not Applicable

[Alonexc]

LGTM

[codecov]

Codecov Report

Merging #3634 (5eaaa4d) into master (4eb819f) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 5eaaa4d differs from pull request most recent head baa01d4. Consider uploading reports for the commit baa01d4 to get more accurate results

@@            Coverage Diff            @@
##             master    #3634   +/-   ##
=========================================
  Coverage     13.76%   13.76%           
  Complexity     1291     1291           
=========================================
  Files           571      571           
  Lines         29239    29239           
  Branches       2885     2885           
=========================================
  Hits           4024     4024           
  Misses        24841    24841           
  Partials        374      374           

Impacted Files	Coverage Δ
...ol/tcp/client/group/ClientSessionGroupMapping.java	0.78% <0.00%> (ø)

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