containers: Don't run bots tests if bots/ does not exist
containers: Don't run bots tests if bots/ does not exist

This is/will be the case on stable cockpit branches.

Closes #10472
cockpit-project/cockpit,martinpitt/cockpit,deryni/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,andreasn/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,andreasn/cockpit,cockpituous/cockpit,andreasn/cockpit,martinpitt/cockpit,andreasn/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,andreasn/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,mvollmer/cockpit,andreasn/cockpit,cockpit-project/cockpit,cockpituous/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,deryni/cockpit,martinpitt/cockpit,garrett/cockpit,andreasn/cockpit,deryni/cockpit