I don’t know what jsLint thinks but if this is a problem and you need a solution then you can do something like the following:
var blah = function() { return undefined; }; // or just return;
Update : I think, Bergi‘s guess is right because, on the jslint site in the Required Blocks section :
JSLint expects that if, while, do and for statements will be made with
blocks {that is, with statements enclosed in braces}.JavaScript allows
an if to be written like this:if (condition) statement;That form is
known to contribute to mistakes in projects where many programmers are
working on the same code. That is why JSLint expects the use of a
block:
if (condition) { statements; }
Experience shows that this form is more resilient.
So, It probably just checks for empty blocks { } and invalidate the blank function.