Check all asset types if `type == null`.
Check all asset types if `type == null`.

According to OpenFL's documentation, `type` is
"The asset type to match, or null to match any type."

player-03/lime,openfl/lime,openfl/lime,player-03/lime,player-03/lime,openfl/lime,player-03/lime,player-03/lime,openfl/lime,player-03/lime,openfl/lime,openfl/lime,player-03/lime,openfl/lime