Previously unlike other transaction types the TX_SCRIPTHASH would not
clear vSolutionsRet, which means that unlike other transaction types if
it was called twice in a row you would get the result of the previous
invocation as well.
Previously an empty script wouldn't be hashed, and CScriptID would be
assigned the incorrect value of 0 instead. This bug can be seen in the
RPC decodescript command:
$ btc decodescript ""
{
"asm" : "",
"type" : "nonstandard",
"p2sh" : "31h1vYVSYuKP6AhS86fbRdMw9XHieotbST"
}
Correct output:
$ btc decodescript ""
{
"asm" : "",
"type" : "nonstandard",
"p2sh" : "3J98t1WpEZ73CNmQviecrnyiWrnqRhWNLy"
}
This allows for a reversal of the current behavior.
This:
CScript foo;
CScriptID bar(foo.GetID());
Becomes:
CScript foo;
CScriptID bar(foo);
This way, CScript is no longer dependent on CScriptID or Hash();
