There are 3 types of creation.

1) Said: Is creating something from nothing, Or speaking something into existence. The power of God's spoken word.
2) Made or formed: Is forming a creation from matter that already exists. God made the firmament.
3) Bring forth: Is a commandment creation. Where God commands his creation to bring forth life (Let the earth bring forth grass).

And there is only one creation that was formed. Man.

gen 2:7 And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.

So when the Bible speaks of an earth without "form" and void. It very well could be saying that the earth was void without the creation of man which was the only "formed" creation.