Add a check for table comment being NULL
Add a check for table comment being NULL

(which can’t normally happen with MySQL, but I guess not every installation out there is normal) (#2791)

abhibeckert/sequelpro,abhibeckert/sequelpro,abhibeckert/sequelpro,Jellyfrog/sequelpro,abhibeckert/sequelpro,Jellyfrog/sequelpro,Jellyfrog/sequelpro,Jellyfrog/sequelpro