remove redundant empty line test=serving

tools/serving_build.sh

@@ -187,7 +187,6 @@ function python_run_criteo_ctr_with_cube() {
             cp ../../../build-server-$TYPE/output/bin/cube* ./cube/ 
             mkdir -p $PYTHONROOT/lib/python2.7/site-packages/paddle_serving_server/serving-cpu-avx-openblas-0.1.3/
             yes | cp ../../../build-server-$TYPE/output/demo/serving/bin/serving $PYTHONROOT/lib/python2.7/site-packages/paddle_serving_server/serving-cpu-avx-openblas-0.1.3/
-
             sh cube_prepare.sh &
             check_cmd "mkdir work_dir1 && cp cube/conf/cube.conf ./work_dir1/"    
             python test_server.py ctr_serving_model_kv &