boot-source-selections api allows adding bogus and duplicated values

Not sure if this is by design or what are the specific consequences of this but one can add duplicated boot source entries in the MAAS db if one runs the following command multiple times:

maas maas boot-source-selections create 1ed50935-a572-4542-8db5-9be4f6fab764 1 release=utopic labels=daily arches=* subarches=*

and get:

    {
        "labels": [
            "daily"
        ],
        "arches": [
            "*"
        ],
        "subarches": [
            "*"
        ],
        "release": "utopic",
        "id": 5,
        "resource_uri": "/MAAS/api/1.0/nodegroups/1ed50935-a572-4542-8db5-9be4f6fab764/boot-sources/1/selections/5/"
    },
    {
        "labels": [
            "daily"
        ],
        "arches": [
            "*"
        ],
        "subarches": [
            "*"
        ],
        "release": "utopic",
        "id": 6,
        "resource_uri": "/MAAS/api/1.0/nodegroups/1ed50935-a572-4542-8db5-9be4f6fab764/boot-sources/1/selections/6/"
    }

Or if one runs:

maas maas boot-source-selections create 1ed50935-a572-4542-8db5-9be4f6fab764 1

the db ends up with an empty entry like:

    {
        "labels": [],
        "arches": [],
        "subarches": [],
        "release": "",
        "id": 3,
        "resource_uri": "/MAAS/api/1.0/nodegroups/1ed50935-a572-4542-8db5-9be4f6fab764/boot-sources/1/selections/3/"
    },