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tests: add test for bad template %include and __base__

Authored by martinvonz.

Description

tests: add test for bad template %include and base

It doesn't seem like we had any tests for %include non-existent and
__base__ = non-existent. The latter raises an error while the former
ignores the include. We should probably also make the former an error.

Differential Revision: https://phab.mercurial-scm.org/D8798