Remove the trow when enum value isn't present in favour of a default value of the enum. It changes the behaviour for #1614

Author: alexeyzimarev

src/RestSharp/Extensions/ReflectionExtensions.cs

@@ -93,9 +93,7 @@ public static bool IsSubclassOfRawGeneric(this Type toCheck, Type generic)
             if (enumValueAsUnderlyingType != null && Enum.IsDefined(type, enumValueAsUnderlyingType))
                 ret = (Enum) Enum.ToObject(type, enumValueAsUnderlyingType);
 
-            if (ret == null)
-                throw new ArgumentOutOfRangeException(value + " undefined for " + type);
-            return ret;
+            return ret ?? Activator.CreateInstance(type);
         }
     }
 }