Description:
When exporting nodes with image fills using the Figma plugin API (exportAsync({ format: "SVG" }) ), the resulting SVG often contains a <pattern> that has no children, while the <image> element ends up separately in <defs>.

The exported shape is filled with fill="url(#pattern…)", but because the <pattern> is empty and doesn’t reference the <image>, nothing is rendered in most SVG viewers (Safari, Chrome, etc.).

Steps to reproduce:

1. Create a Polygon / Vector node.

2. Apply an image fill.

3. Export via plugin with: await node.exportAsync({ format: "SVG" })

4. Inspect the SVG:

   • Shape uses fill="url(#pattern0…)"

   • <pattern> is empty (<pattern …></pattern>)

   • <image> with the base64 JPEG is present in <defs>, but never referenced.

5. Open the SVG in a browser → the shape appears invisible.

Expected result:

• Exported shape is visible

Actual result:

• The <pattern> is empty, causing shapes to render invisible.

• This breaks exported SVG

Request:
Please update the SVG exporter so that image fills always produce a valid <pattern> (with an <image> child), or otherwise avoid emitting empty patterns that cause the shapes to disappear.