Fix bug with TinyMCE not working for steps with nil description
Fix bug with TinyMCE not working for steps with nil description

Closes SCI-1321.

mlorb/scinote-web,Ducz0r/scinote-web,mlorb/scinote-web,mlorb/scinote-web,Ducz0r/scinote-web,Ducz0r/scinote-web