Fix EntryPointBuilder when no GET collection operation
Fix EntryPointBuilder when no GET collection operation

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