fix the bug that caused ipynb files to not save -- it was just something wrong with the cb --> async rewrite
fix the bug that caused ipynb files to not save -- it was just something wrong with the cb --> async rewrite

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