Undefined method 'html_safe' for nil: cached template.source missing

[mcary]

I'm running into trouble with sharing stache templates between server and client on Rails 4.2.0. Once the template is rendered on the server, I get this error when calling template_include_tag in the template:

  1) Some example
     Failure/Error: Unable to find matching line from backtrace
     ActionView::Template::Error:
       undefined method `html_safe' for nil:NilClass
     # ./app/views/pages/index.html.erb:3:in `_app_views_pages_index_html_erb__933758841857237125_70177580457500'

It looks like the problem is that when template_include_tag looks up the template and it was cached, template.source is nil. Based on the template refresh method, I gather this is intended, perhaps to keep the cache leaner.

The refresh method uses lookup_context.disable_cache to ensure the source is present. Doing the same inside of template_include_tag seems to fix the issue in my test case.

Would you like me to submit a pull request to address the issue that way? I don't have spec coverage for it within stache yet; I only have an integration test in my rails app that exercises the failure case.

[mcary]

I have a fix here, but no tests within stache yet:
https://github.com/mcary/stache/tree/fix-helper-with-caching