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The GFM callout renderer would crash with internal_error() when rendering callouts that had a title but no body content, because it didn't handle the case where callout.content is nil. This fix applies the same nil-safe pattern used by other format renderers (EPUB, RevealJS): default to empty Blocks when content is nil.
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The GFM callout renderer would crash with internal_error() when rendering callouts that had a title but no body content, because it didn't handle the case where callout.content is nil.
This fix applies the same nil-safe pattern used by other format renderers (EPUB, RevealJS): default to empty Blocks when content is nil.
closes #13603