Subtitle not rendered as expected when its values is zero

[gasparpn]

Problem

When the value of the Subtitle is equal to zero the size of the Title becomes bigger and the value of the Subtitle stays in front of the Title instead of below it.

Screenshot

Sugestion

In line 151 of the file node-renderer-default.js there is no verification if the variable nodeSubtitle is an integer, so the value zero becomes falsy.

Reference

Here is an article that may help to solve the problem.