fix  https://github.com/sagemathinc/cocalc/issues/2692  -- output metadata in ipynb generation dropped
fix  https://github.com/sagemathinc/cocalc/issues/2692  -- output metadata in ipynb generation dropped

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