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Miguel Ángel
8802c3fdf8
## Problem The most common render failure in recent reports is: ``` Cannot destructure property 'firstElementChild' of 'documentElement' as it is null. ``` It appears when a `data-composition-src` file resolves to empty or unparsable HTML, and started showing up after the render pipeline change in 0.6.73. ## Root cause When a sub-composition file is empty or unparsable, linkedom's `parseHTML` returns a document with a null `documentElement`, and the shared inliner (`packages/core/src/compiler/inlineSubCompositions.ts`) dereferences `.body`/`.head` on it, crashing inside linkedom internals with the cryptic destructure error instead of telling the user what's wrong. ## Fix Guard the resolved sub-composition HTML and the extracted content HTML in the shared inliner: empty or unparsable input now fails with an actionable error naming the offending file. ## Testing - New tests in core and producer reproducing the empty sub-composition case (previously crashed with the destructure error, now throws the actionable message). - `bun run build` green, all tests pass in the changed test files.