The past_abilites field in pokemon endpoint has some redundant data which points to no actual ability for example for bulbasaur (1)

"past_abilities": [
    {
        "abilities": [
            {
                "ability": null,
                "is_hidden": true,
                "slot": 3
            }
        ],
        "generation": {
            "name": "generation-iv",
            "url": "https://pokeapi.co/api/v2/generation/4/"
        }
    }
]

imo either it should point to an ability resource or the past_abilities array should be empty also idt bulbasaur got any change of abilities and this issue is across a bunch of pokemon where the ability_id is blank in here https://github.com/PokeAPI/pokeapi/blob/master/data/v2/csv/pokemon_abilities_past.csv which is causing this

think historically it got added somewhere around here in this commit b23cd6f removing the rows with blank entries should fix it

just wanted to ask tho was there any reason why it was added that I might be missing? thank you :)

cc: @jemarq04