Null check recipe
fixes #203
Remove the fusion star
Dispenser can place/recover chemical fluid. And fix an unchecked class cast.

Signed-off-by: yushijinhun <yushijinhun@gmail.com>
Fix cannot recover element fluid with empty element.

Signed-off-by: yushijinhun <yushijinhun@gmail.com>
Fix cannot recover water.

Signed-off-by: yushijinhun <yushijinhun@gmail.com>