minor: Clean up blank lines in tests.

frontend_tests/node_tests/general.js

@@ -451,7 +451,6 @@ run_test('insert_message', () => {
     assert.equal(inserted_message.content, 'example content');
 });
 
-
 /*
 
    The previous example starts to get us out of the data layer of
@@ -710,7 +709,6 @@ run_test('stream_list', () => {
     const sidebar_helper = make_sidebar_helper();
     const topic_list_helper = make_topic_list_helper();
 
-
     // This is what we are testing!
     stream_list.update_streams_sidebar();