Eliminate warning when 'ssl' not set (#37849)
Eliminate warning when 'ssl' not set (#37849)

When not specifying 'ssl' in a config file, the following warning
is displayed:

`[WARNING ] Key 'ssl' with value None has an invalid type of NoneType,
a dict is required for this value`

This has been caused by PR #37776.

Fix this by allowing `None` as a valid value for `ssl`.

Signed-off-by: Sergey Kizunov <dfddabaa9af05982b01940b837a87844148069c9@ni.com>
saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt