In 2f547ea, the custom `has_error` logic in BaseDocumentationSpider
was removed in favor of checking whether any errors were logged.
One reference to that method was missed in UnusedImagesLinterSpider
and went unremarked as no images were added to the documentation
that were not used.
Replaces that reference with an error log.
This directory contains scripts that are used in building, managing,
testing, and other forms of work in a Zulip development environment.
Note that tools that are also useful in production belong in
scripts/ or should be Django management commands.
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