Increase code coverage for core packages (#12872)

packages/core/src/code_assist/server.ts

@@ -232,18 +232,16 @@ export class CodeAssistServer implements ContentGenerator {
 
       let bufferedLines: string[] = [];
       for await (const line of rl) {
-        // blank lines are used to separate JSON objects in the stream
-        if (line === '') {
+        if (line.startsWith('data: ')) {
+          bufferedLines.push(line.slice(6).trim());
+        } else if (line === '') {
           if (bufferedLines.length === 0) {
             continue; // no data to yield
           }
           yield JSON.parse(bufferedLines.join('\n')) as T;
           bufferedLines = []; // Reset the buffer after yielding
-        } else if (line.startsWith('data: ')) {
-          bufferedLines.push(line.slice(6).trim());
-        } else {
-          throw new Error(`Unexpected line format in response: ${line}`);
         }
+        // Ignore other lines like comments or id fields
       }
     })();
   }