Allow skipping installation if already installed

[OrBin]

The installation step itself takes a long time, relative to the rest of the role.
I think it may allow skipping this task if it's already installed (i.e. the destination directory exists).

Thanks!

[tersmitten]

There're already checks in place. See https://github.com/Oefenweb/ansible-pycharm/blob/master/tasks/main.yml#L43

But they might be failing. Can you have a look?

[OrBin]

I didn't notice them before. I'll have a look, but not sure I'll get to do it today.

[tersmitten]

No worries