fix: lsp: Don't send didOpen events for documents with no URL

Fixes #3683

helix-term/src/application.rs

@@ -505,8 +505,13 @@ impl Application {
                             let language_id =
                                 doc.language_id().map(ToOwned::to_owned).unwrap_or_default();
 
+                            let url = match doc.url() {
+                                Some(url) => url,
+                                None => continue, // skip documents with no path
+                            };
+
                             tokio::spawn(language_server.text_document_did_open(
-                                doc.url().unwrap(),
+                                url,
                                 doc.version(),
                                 doc.text(),
                                 language_id,