Miner can mine even there is no transaction

[MehbubRashid]

a miner can mine as much as he wants and earn coins

[conradoqg]

Yes, initially I left it like this to be easier to use it. But of course, in a real-world case, the node should ensure that a block is not accepted with empty transactions (or if it doesn't follow a threshold of transactions, size or unconfirmed transactions).

What you think I should do in this case? Do I force a minimal amount of transactions?

[conradoqg]

I've added a comment to the checkBlock method explaining the above options.