IsEmpty

IsEmpty is used at run time in 8 crates (of which 1 optionally). It is a direct run-time dependency in 4 crates.

Depender (with downloads and own rev deps)			IsEmpty version
130		neopasses		^0.2.0
		passes		^0.2.0
	3	trustchain-http		^0.2.0
	1	siopv2		^0.2.0