Function ensure_keyword_exists 

fn ensure_keyword_exists(
    keyword: &Keyword,
    map: &mut HashMap<Keyword, Value>,
) -> Result<Value, BridgeError>

Ensures a Keyword exists in a HashMap, removes it and returns it.

This is a helper function to ensure expected values are set while throwing context-rich errors if they don’t.

Errors

Returns an error if keyword is not a key in map.