fix https://github.com/sagemathinc/smc/issues/981 -- now that comments are not removed, block parsing must be changed slightly (to remove comments later)
fix https://github.com/sagemathinc/smc/issues/981 -- now that comments are not removed, block parsing must be changed slightly (to remove comments later)

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