test: refactor JSON.DEL test

[bsbodden]

The behavior of REDIS when deleting a non-existing path in a JSON document changed from throwing an error to ignoring it. This addresses that change.

[codecov]

Codecov Report

Merging #32 (622d008) into master (b78c99e) will increase coverage by 2.64%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   58.94%   61.58%   +2.64%     
==========================================
  Files           2        2              
  Lines         151      151              
  Branches       14       14              
==========================================
+ Hits           89       93       +4     
+ Misses         53       49       -4     
  Partials        9        9              

Impacted Files	Coverage Δ
...ain/java/com/redislabs/modules/rejson/JReJSON.java	60.68% <50.00%> (+2.75%)	⬆️

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