Select a radio button on the select environment radios

[yatil]

The HTML 5 required yields an error if no radio button is selected:

• If the user has no environment yet, the first created environment should be selected.
• If a user has one environment, this environment should be selected.
• If a user has more than one environment, the environment selected on the last previous set of tests should be selected. (If impossible, select the first one.)

[evlach]

Now when selected once is saved in the session and not need to select again. When not selected seems to me dangerous to select a random one.. (??)