[qa] covers __main__, and formating.

bonobo/execution/base.py

@@ -8,6 +8,7 @@ from bonobo.plugins import get_enhancers
 from bonobo.util.errors import print_error
 from bonobo.util.objects import Wrapper, get_name
 
+
 @contextmanager
 def recoverable(error_handler):
     try:
@@ -15,6 +16,7 @@ def recoverable(error_handler):
     except Exception as exc:  # pylint: disable=broad-except
         error_handler(exc, traceback.format_exc())
 
+
 @contextmanager
 def unrecoverable(error_handler):
     try:
@@ -23,6 +25,7 @@ def unrecoverable(error_handler):
         error_handler(exc, traceback.format_exc())
         raise  # raise unrecoverableerror from x ?
 
+
 class LoopingExecutionContext(Wrapper):
     alive = True
     PERIOD = 0.25