Print a warning if defer is not a boolean.

Author: Michael Koval

src/prpy/base/robot.py

@@ -316,6 +316,10 @@ def do_postprocess():
 
             return wrap_future(executor.submit(do_postprocess))
         else:
+            if defer is not False:
+                logger.warning('Received unexpected value "%s" for defer.',
+                               defer)
+
             return do_postprocess()
 
     def ExecutePath(self, path, defer=False, executor=None, **kwargs):
@@ -359,6 +363,10 @@ def do_execute():
 
             return wrap_future(executor.submit(do_execute))
         else:
+            if defer is not False:
+                logger.warning('Received unexpected value "%s" for defer.',
+                               defer)
+
             return do_execute()
 
     def ExecuteTrajectory(self, traj, defer=False, timeout=None, period=0.01):
@@ -436,6 +444,10 @@ def do_poll():
 
             return trollius.async(do_poll())
         else:
+            if defer is not False:
+                logger.warning('Received unexpected value "%s" for defer.',
+                               defer)
+
             util.WaitForControllers(active_controllers, timeout=timeout)
 
         return traj