Pybars behaves differently than Handlebars.js for the {{# if ...}}{{else}}{{/if}} construct. Handlebars.js acts exactly as I would expect, while Pybars always treats the values between {{else}} and {{/if}} as if they didn't exist. Here are solutions I see in decreasing order of desirability.
1. Pybars should handle {{else}} just like Handlebars.js
2. Otherwise, Pybars should fail when you try to compile a template with an {{else}} block.
3. Otherwise, Pybars should document the {{else}} situation.
from pybars import Compiler
template = Compiler().compile(u"""
{{# if check}}
yep.
{{else}}
nope.
{{/if}}""")
template({"check": True}) # Outputs yep.
template({"check": False}) # Outputs nothing. It should output nope.
template({}) # Outputs nothing. It should output nope.
var template = Handlebars.compile([
'{{# if check}}',
' yep.',
'{{else}}',
' nope.',
'{{/if}}'].join("\n"));
template({"check": true}); // yep.
template({"check": false}); // nope.
template({}); // nope.
Oh, whoops, I see you've already seen this. Release a new version pleeeeease!