Revert "Add some space between elements in contact forms"

This reverts commit b60a5d2e84ea9d05555761dfafe16ffbc8386046.
Revert "Allow the user to select email recipient on the dataset page"

This reverts commit a52e86441a21a4c75a851de8efd9c6c219d9928a.
Allow selecting the email recipient on the dataset page, take 2
Avoid a server error on invalid email recipient