fixed loading of executive tests, unrevealed failing consensus tests

json/src/vm/call.rs

@@ -19,6 +19,7 @@
 use bytes::Bytes;
 use hash::Address;
 use uint::Uint;
+use maybe::MaybeEmpty;
 
 /// Vm call deserialization.
 #[derive(Debug, PartialEq, Deserialize)]
@@ -26,7 +27,7 @@ pub struct Call {
 	/// Call data.
 	pub data: Bytes,
 	/// Call destination.
-	pub destination: Address,
+	pub destination: MaybeEmpty<Address>,
 	/// Gas limit.
 	#[serde(rename="gasLimit")]
 	pub gas_limit: Uint,