[kotlin][spring] Fix ApiUtil compilation#6084

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jimschubert merged 2 commits intoOpenAPITools:masterfrom

sylvainmoindron:5476-ApiUtil-object-doesnt-compile

Jun 5, 2020

Commits on Apr 28, 2020

#5476 [kotlin] [spring] add null safe check to apiUtil
sylvainmoindron
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#5476 [kotlin] [spring] generate sample petstore for kotlin
sylvainmoindron
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