Sending a [CR] will repeat the previous command

[Nakakiyo092]

Description of the bug

Sending a [CR] to CANable will repeat the previous command.

To reproduce

Send the following commands in order.

V[CR]
[CR]

The CANable will reply like:

b158aa7 github.com/normaldotcom/canable2-fw
b158aa7 github.com/normaldotcom/canable2-fw

Expected behavior

The second command [CR] should not create version string since it's not a V command.