Test assert server list if exists

[codecov-io]

Codecov Report

Merging #84 into master will not change coverage. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #84   +/-   ##
=========================================
  Coverage     94.86%   94.86%           
  Complexity       98       98           
=========================================
  Files            21       21           
  Lines           292      292           
  Branches          8        8           
=========================================
  Hits            277      277           
  Misses            9        9           
  Partials          6        6

Impacted Files	Coverage Δ	Complexity Δ
...ixhours/memcached/cache/MemcachedCacheManager.java	88.88% <100%> (ø)	9 <1> (ø)	:arrow_down:

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[sasabolic]

Thanks