snap: fix bug where my previous refactor made it actually not take any snapshots at all.  ugh.
snap: fix bug where my previous refactor made it actually not take any snapshots at all.  ugh.

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