Useless input - logic circuits drawing convention
Firstly, it's conventional to number bits like digits, from the right, and from zero:

b3 b2 b1 b0


Secondly, you should test your circuit with some testcases, as it doesn't act as a >=10 comparator. For example, it reports true for 9 (1001 binary).

Thirdly, you can just leave things disconnected. I've sometimes seen the convention of drawing an X on the end to indicate "deliberately disconnected output". Disconnected inputs are considered bad and should be tied to 1 or 0.