Chicken and Egg confusion over Bitcoin generation
A valid Bitcoin block has to include a minimum of one transaction, which is the coinbase transaction that pays out the block reward. Most of the early Bitcoin blocks did not include transactions that sent bitcoins from one party to other, but included only the coinbase transaction that paid out the newly minted bitcoins.

In fact, the first transaction wherein an exchange of coins occurred was in block #170, when Satoshi sent 10 BTC to Hal Finney