Improve ScriptNulldata tests to ensure short strings work okay.
Improve ScriptNulldata tests to ensure short strings work okay.

moocowmoo/pycoin,XertroV/pycoin,richardkiss/pycoin,mperklin/pycoin,zsulocal/pycoin,shayanb/pycoin,mperklin/pycoin,pycoin/pycoin,moocowmoo/pycoin,shayanb/pycoin,Magicking/pycoin,XertroV/pycoin,pycoin/pycoin,shivaenigma/pycoin,Magicking/pycoin,richardkiss/pycoin,shivaenigma/pycoin,zsulocal/pycoin