storage: Fix empty tooltips in storage page
storage: Fix empty tooltips in storage page

Fixes #10750
Closes #10752

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