[GraphQL] Make the error handler final (#3643)
[GraphQL] Make the error handler final (#3643)


vincentchalamon/core,soyuka/DunglasApiBundle,api-platform/core,vincentchalamon/core,soyuka/core,meyerbaptiste/core,vincentchalamon/core,api-platform/core,meyerbaptiste/core,api-platform/core,meyerbaptiste/core,meyerbaptiste/core,soyuka/core,soyuka/core,vincentchalamon/core,soyuka/core,api-platform/core