--deps all will cause failures when element has no dependencies

this should be fixed in bst and may not be an issue when we move to later versions:

[--:--:--][        ][    main:core activity                 ] START   Loading elements
[00:00:00][        ][    main:core activity                 ] SUCCESS Loading elements
[--:--:--][        ][    main:core activity                 ] START   Resolving elements
[00:00:00][        ][    main:core activity                 ] SUCCESS Resolving elements
[--:--:--][        ][    main:core activity                 ] START   Initializing remote caches
[00:00:00][        ][    main:core activity                 ] SUCCESS Initializing remote caches
[--:--:--][        ][    main:core activity                 ] START   Resolving cached state
[00:00:00][        ][    main:core activity                 ] SUCCESS Resolving cached state
[--:--:--][        ][    main:toolchain-tarball-x86_64.bst  ] START   Staging dependencies
[00:00:00][        ][    main:toolchain-tarball-x86_64.bst  ] FAILURE Staging dependencies

Error while staging dependencies into a sandbox: 'No artifacts to stage'

    No artifacts have been cached yet for that element
    Try building the element first with `bst build`