Handle null jsonProperty.UnderlyingName values
Handle null jsonProperty.UnderlyingName values

In some scenarios the jsonProperty.UnderlyingName is null. For instance if we have custom contract resolvers like in https://github.com/kekekeks/hal-json-net/blob/5292c6f85c819e5fbcd26c13afe79aff3becfc04/HalJsonNet/Serialization/JsonNetHalJsonContactResolver.cs#L60 that inject custom values in the response.

As a side effect of this change the response model will default to object.

Note that without this, the API swagger generation process throw an exception.
xMarkos/Swashbuckle,Cussa/Swashbuckle,tareq-s/Swashbuckle,Rolive0712/Swashbuckle,VirtoCommerce/Swashbuckle,bigtlb/Swashbuckle,davetransom/Swashbuckle,partychen/Swashbuckle,Colligo/Swashbuckle,yonglehou/Swashbuckle,domaindrivendev/Swashbuckle,Colligo/Swashbuckle,Atomosk/Swashbuckle,kienct89/Swashbuckle,kredinor/Swashbuckle,gliljas/Swashbuckle,VirtoCommerce/Swashbuckle,davetransom/Swashbuckle,fffej/Swashbuckle,henning-krause/Swashbuckle,jruckert/Swashbuckle,bigtlb/Swashbuckle,enkafan/Swashbuckle,davetransom/Swashbuckle,kredinor/Swashbuckle,Driedas/Swashbuckle,partychen/Swashbuckle,svickers/Swashbuckle,enkafan/Swashbuckle,tareq-s/Swashbuckle,Driedas/Swashbuckle,VirtoCommerce/Swashbuckle,lostllama/Swashbuckle,yonglehou/Swashbuckle,kienct89/Swashbuckle,gliljas/Swashbuckle,martincostello/Swashbuckle,svickers/Swashbuckle,yonglehou/Swashbuckle,Rolive0712/Swashbuckle,domaindrivendev/Swashbuckle,gliljas/Swashbuckle,xMarkos/Swashbuckle,kredinor/Swashbuckle,partychen/Swashbuckle,domaindrivendev/Swashbuckle,Cussa/Swashbuckle,lostllama/Swashbuckle,davetransom/Swashbuckle,Atomosk/Swashbuckle,jruckert/Swashbuckle,lostllama/Swashbuckle,Rolive0712/Swashbuckle,replaysMike/Swashbuckle,enkafan/Swashbuckle,bdhess/Swashbuckle,fffej/Swashbuckle,Driedas/Swashbuckle,Colligo/Swashbuckle,martincostello/Swashbuckle,kienct89/Swashbuckle,jruckert/Swashbuckle,Atomosk/Swashbuckle,yonglehou/Swashbuckle,Cussa/Swashbuckle,kienct89/Swashbuckle,tareq-s/Swashbuckle,henning-krause/Swashbuckle,bdhess/Swashbuckle,Colligo/Swashbuckle,Cussa/Swashbuckle,xMarkos/Swashbuckle,henning-krause/Swashbuckle,tareq-s/Swashbuckle,svickers/Swashbuckle,Rolive0712/Swashbuckle,Atomosk/Swashbuckle,henning-krause/Swashbuckle,Driedas/Swashbuckle,bdhess/Swashbuckle,enkafan/Swashbuckle,fffej/Swashbuckle,replaysMike/Swashbuckle,martincostello/Swashbuckle,replaysMike/Swashbuckle,xMarkos/Swashbuckle,bigtlb/Swashbuckle,jruckert/Swashbuckle,fffej/Swashbuckle,martincostello/Swashbuckle,replaysMike/Swashbuckle,VirtoCommerce/Swashbuckle,svickers/Swashbuckle,gliljas/Swashbuckle,partychen/Swashbuckle,bdhess/Swashbuckle,bigtlb/Swashbuckle,lostllama/Swashbuckle,kredinor/Swashbuckle