Fixes setting auth cookie during install, removes some try/catch/swallow with some error messaging, converts some String -> string and == false updates.

src/Umbraco.Web/Models/Mapping/UserModelMapper.cs

@@ -52,7 +52,7 @@ namespace Umbraco.Web.Models.Mapping
                 .ForMember(detail => detail.Username, opt => opt.MapFrom(user => user.Username))
                 .ForMember(detail => detail.Culture, opt => opt.MapFrom(user => user.GetUserCulture(applicationContext.Services.TextService)))
                 .ForMember(detail => detail.SessionId, opt => opt.MapFrom(user => user.SecurityStamp.IsNullOrWhiteSpace() ? Guid.NewGuid().ToString("N") : user.SecurityStamp));
-
+            
         } 
      
         private static int GetIntId(object id)