Added a unit test for the type JsonArray, to test empty string conversion.
Added a unit test for the type JsonArray, to test empty string conversion.

cassvail/dbal,stof/dbal,stof/dbal,doctrine/dbal,cassvail/dbal,kimhemsoe/dbal,deeky666/dbal,DHager/dbal,tk-s/dbal,helicon-os/doctrine-dbal,wuxu92/dbal,drieschel/dbal,v-bartusevicius/dbal,mRoca/dbal,janschoenherr/dbal,arima-ryunosuke/dbal,mathroc/dbal,vortgo/dbal,tk-s/dbal,mbeccati/dbal,lafourchette/dbal,bspeterson/dbal,vutung2311/dbal,vutung2311/dbal,gencer/dbal,gencer/dbal,helicon-os/doctrine-dbal,stchr/dbal,shivergard/dbal,mbeccati/dbal,mikeSimonson/dbal,mihai-stancu/doctrine-dbal,mathroc/dbal,mihai-stancu/doctrine-dbal,zeroedin-bill/dbal,Tobion/dbal,arima-ryunosuke/dbal,zeroedin-bill/dbal,lafourchette/dbal,mikeSimonson/dbal,mihai-stancu/dbal,drieschel/dbal,mihai-stancu/dbal,deeky666/dbal,vortgo/dbal,stchr/dbal,bspeterson/dbal,nfrignani/dbal,nfrignani/dbal,kimhemsoe/dbal,wuxu92/dbal,arima-ryunosuke/dbal,lcobucci/dbal,janschoenherr/dbal,doctrine/dbal,BenMorel/dbal,AlexDpy/dbal,Tobion/dbal,DHager/dbal,BenMorel/dbal,mRoca/dbal,v-bartusevicius/dbal,lcobucci/dbal,shivergard/dbal,AlexDpy/dbal