tweaked locking in GetTransaction
tweaked locking in GetTransaction

coinkeeper/2015-06-22_18-48_syscoin,coinkeeper/2015-06-22_18-48_syscoin,coinkeeper/2015-06-22_18-48_syscoin,coinkeeper/2015-06-22_18-48_syscoin,coinkeeper/2015-06-22_18-48_syscoin,coinkeeper/2015-06-22_18-48_syscoin