Fix Runtime exception in DataFetcher on GraphQL '__typename' field

[igdianov]

Fixes #31

[codecov-io]

Codecov Report

Merging #32 into master will increase coverage by 0.47%.
The diff coverage is 84.61%.

@@             Coverage Diff              @@
##             master      #32      +/-   ##
============================================
+ Coverage     61.26%   61.73%   +0.47%     
- Complexity      207      212       +5     
============================================
  Files            21       21              
  Lines          1425     1427       +2     
  Branches        201      203       +2     
============================================
+ Hits            873      881       +8     
+ Misses          447      444       -3     
+ Partials        105      102       -3

Impacted Files	Coverage Δ	Complexity Δ
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	68.31% <84.61%> (+1.56%)	87 <3> (+4)	⬆️
...ry/schema/impl/GraphQLJpaOneToManyDataFetcher.java	71.42% <0%> (+1.78%)	10% <0%> (+1%)	⬆️

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