Field objects are allowed to be supplied without declaring blocks

[rudy-on-rails]

GraphQL endpoints do not necessarily need to specify fields as arguments when a mutation or query is received. Diverse implementations on the server-side will allow for returning non-standardized data formats, such as JSON, which breaks this library.

Fixes: #31

[codecov-commenter]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #37   +/-   ##
=========================================
  Coverage     88.55%   88.55%           
  Complexity       68       68           
=========================================
  Files            16       16           
  Lines           166      166           
  Branches         28       28           
=========================================
  Hits            147      147           
  Misses           10       10           
  Partials          9        9           

Impacted Files	Coverage Δ	Complexity Δ
core/src/main/kotlin/me/lazmaid/kraph/Kraph.kt	96.77% <100.00%> (ø)	14.00 <0.00> (ø)

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