- part II of #1253
- an expected case in template .cshtml files
- expression has name `""`; led to `ArgumentException` in `ModelExpression`
- test `@Model` and `@model.Property` in unit and functional tests
- update baselines to match
nits:
- remove a few unecessary `@`s in .cshtml files
- correct field names & ids in ProductList.cshtml (`foreach` confuses MVC)
- led to correct valiation attributes as well
