Ever stumbled over something like this:
undefined:55
((__t=( filename ))==null?'':__t)+
^
ReferenceError: filename is not defined
at eval (eval at <anonymous> (/usr/lib/node_modules/jsdoc/node_modules/underscore/underscore.js:1262:16), <anonymous>:55:9)
at template (/usr/lib/node_modules/jsdoc/node_modules/underscore/underscore.js:1270:21)
at exports.Template.partial (/usr/lib/node_modules/jsdoc/lib/jsdoc/template.js:62:29)
at exports.Template.render (/usr/lib/node_modules/jsdoc/lib/jsdoc/template.js:81:24)
.....
Well, then you've been using the -u switch, eh? Problem is that the template in tmpl/layout.tmpl uses the unbound javascript variable filename, which then, per underscore.js's template documentation, requires an object passed in with a property named filename as well.
You're doing this well for the other kinds of renderings, but not for the tutorials.
I fixed the problem locally by defining a property filename with value filename (the parameter for the function generateTutorial) on the tutorialData object, in publish.js around line 490.