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templater: add exception-raising version of open_template()
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Authored by martinvonz on Aug 6 2020, 2:29 PM.

Details

Summary

I'm about to add another caller of open_template() (in the template
loader). That caller will want to get exceptions instead of `(None,
None)` if the template doesn't exist. This patch therefore changes
open_template() to raise exceptions and adds a new
try_open_template() that returns the (None, None) value.

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