Exceptions When Using Rawlog

If you don't use dblog (I use rawlog) you will receive multiple exceptions:

user warning: Table 'sandbox_local.watchdog' doesn't exist query: SELECT * FROM watchdog WHERE type='cron exception' ORDER BY wid DESC in C:\opt\www\sandbox\sites\all\modules\contrib\supercron\supercron.module on line 292.

I've attached a patch that short circuits the offending code when dblog isn't enabled. This patch was rolled against v1.3.