sync: fix exception that was happening in frontend (this is good on general principle, but probably doesn't help with anything yet).
sync: fix exception that was happening in frontend (this is good on general principle, but probably doesn't help with anything yet).

tscholl2/smc,DrXyzzy/smc,sagemathinc/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,DrXyzzy/smc,DrXyzzy/smc,DrXyzzy/smc,tscholl2/smc,tscholl2/smc