Fix nil pointer dereference in addLink when HTML parse fails#51
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When external link card HTML parsing fails, post.Embed could still be nil, leading to a nil pointer dereference on post.Embed.EmbedExternal. Initialize post.Embed before assigning.
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In the fallback branch where external link card HTML parsing fails,
post.Embedmay still benil, causing a nil pointer dereference when assigningpost.Embed.EmbedExternal. Initializepost.Embedbefore use.