Now inserters don't drop items on the floor if there isn't any belt or another entity. (Mining drills included.)
Changelogs:
-1.0.0:
Released!

Other things:
-Known bug/funny behaviour
When an inserter is deactivated, it stays in its position (like when power goes down). Same thing when the inserter is rotated, so it's difficult to understand the actual direction of the inserter.
When an inserter is deactivated and is holding items, items are lost. This happens when the target chest is destroyed by alien or when a robot picked up the chest.
An inserters that drops item where another inserter picks them is still deactivated (chained inserters). Consider placing a small chest at the place for small buffer.
Adding this mod to an existing saved game won't change anything. Only newly built or rotated inserters will be handled.
When an Uranium mining drill is deactivated, it will stop transfer acid to adjacent mining drill.

Original by Ellomir, fixed for 0.16 by DiegoPro77 (thank you for you great work Ellomir ;D.)