storage: Hide mount point mapping scenario when no mountable partitio…

…ns are available

After consulting with our designer, we opted to completely hide the mount point mapping scenario
when no mountable partitions are present, rather than simply disabling it.
This change helps reduce UI clutter and provides a cleaner, more intuitive experience.
By removing an unusable option from view, we aim to prevent confusion for users, particularly those
less experienced, who might otherwise encounter a scenario they cannot interact with.

src/components/storage/InstallationScenario.jsx

@@ -126,8 +126,8 @@ const checkMountPointMapping = ({ mountPointConstraints, selectedDisks, usablePa
             .filter(device => device.formatData.mountable.v || device.formatData.type.v === "luks").length > 0;
 
     if (!hasFilesystems) {
-        availability.available = false;
-        availability.reason = _("No usable devices on the selected disks.");
+        // No usable devices on the selected disks: hide the scenario to reduce UI clutter
+        availability.hidden = true;
     } else if (missingNMParts.length) {
         availability.available = false;
         availability.reason = cockpit.format(_("Some required partitions are missing: $0"), missingNMParts.join(", "));