E301 expected 1 blank line, found 0

docker_build.py

@@ -137,6 +137,7 @@
     cmd = ['./odoo_scripts/docker_build_copy']
     logging.debug(' '.join(cmd))
     call(cmd)
+
     # clean on exit
     def signal_handler(code, frame):
         cmd = ['./odoo_scripts/docker_build_clean']