This commit adds a conditional inside the constructor so that if a user
didn't specified an image parameter all the code related to the image
version comparison is omitted.
This is extremely useful when a user want to just stop and start
containers using just the name, keeping everything as it is, without the
need of specifying all the image and command stuff used at creation.
Today if you don't specify the image you get an error, and this is a
confusing [1] behavior.
[1] https://github.com/ansible/ansible/issues/27960
86387df8b3