Add a scenario for not-existing attributes.
Add a scenario for not-existing attributes.

jdeniau/DunglasApiBundle,jdeniau/DunglasApiBundle,soyuka/core,api-platform/core,api-platform/core,meyerbaptiste/core,jdeniau/DunglasApiBundle,jdeniau/DunglasApiBundle,meyerbaptiste/core,api-platform/core,dunglas/DunglasApiBundle,soyuka/core,leesiongchan/DunglasApiBundle,soyuka/DunglasApiBundle,theofidry/DunglasApiBundle,yelmontaser/DunglasApiBundle,lucascherifi/DunglasApiBundle,vincentchalamon/core,vincentchalamon/core,teohhanhui/DunglasApiBundle,teohhanhui/api-platform-core,vincentchalamon/core,ahlee2326/DunglasApiBundle,meyerbaptiste/core,soyuka/core,teohhanhui/api-platform-core,vincentchalamon/core,meyerbaptiste/core,api-platform/core,teohhanhui/api-platform-core,soyuka/core,teohhanhui/api-platform-core