Fix everything.

substrate/wasm-runtime/polkadot/src/lib.rs

@@ -47,12 +47,9 @@ pub fn execute_block(input: &[u8]) -> Vec<u8> {
 
 /// Execute a given, serialised, transaction. Returns the empty vector.
 pub fn execute_transaction(input: &[u8]) -> Vec<u8> {
-	if input.len() == 0 {
-		panic!("no transaction data given!");
-	}
 	let utx = UncheckedTransaction::from_slice(input).unwrap();
 	runtime::system::execute_transaction(&utx);
-	input.to_vec()//Vec::new()
+	Vec::new()
 }
 
 impl_stubs!(execute_block, execute_transaction);

substrate/wasm-runtime/polkadot/src/runtime/system.rs

@@ -20,6 +20,7 @@
 use primitives::{Block, BlockNumber, Hash, UncheckedTransaction, TxOrder, Hashable};
 use runtime_support::mem;
 use runtime_support::prelude::*;
+use runtime_support::print;
 use storable::Storable;
 use keyedvec::KeyedVec;
 use environment::with_env;
@@ -84,6 +85,7 @@ pub fn execute_block(mut block: Block) {
 
 /// Execute a given transaction.
 pub fn execute_transaction(utx: &UncheckedTransaction) {
+	print(&b"HERE"[..]);
 	// Verify the signature is good.
 	assert!(utx.ed25519_verify(), "All transactions should be properly signed");