TRIANGLE_LIST with no points crashes rviz when namespace unchecked

[lucasw]

Or when the entire Marker enable is unchecked.

The frame_id has to be valid to get to the bug.

This error message is produced prior to unchecking the box and crashing:

/0
TriMesh marker [/0] has no points.

And this is the terminal output after unchecking the box:

[ WARN] [/rviz_1508383767337950367] [/home/lucasw/tmp_catkin_ws2/src/rviz/src/rviz/ogre_helpers/ogre_logging.cpp]:[53] [OGRE EXCEPTION(2:InvalidParametersException): Cannot destroy a null MovableObject. in SceneManager::destroyMovableObject at /build/ogre-1.9-mqY1wq/ogre-1.9-1.9.0+dfsg1/OgreMain/src/OgreSceneManager.cpp (line 6988)]
terminate called after throwing an instance of 'Ogre::InvalidParametersException'
  what():  OGRE EXCEPTION(2:InvalidParametersException): Cannot destroy a null MovableObject. in SceneManager::destroyMovableObject at /build/ogre-1.9-mqY1wq/ogre-1.9-1.9.0+dfsg1/OgreMain/src/OgreSceneManager.cpp (line 6988)
Aborted (core dumped)

#!/usr/bin/env python
import rospy
from visualization_msgs.msg import Marker

rospy.init_node('test_empty_marker_array')
marker_pub = rospy.Publisher('visualization_marker', Marker, queue_size=1)
rospy.sleep(0.5)
marker = Marker()
marker.header.frame_id = "map"
marker.type =  Marker.TRIANGLE_LIST
marker_pub.publish(marker)

I can supply a full backtrace and possibly a PR later.

I've tried this on the Kinetic released version and the latest github kinetic-devel branch with the same effect.

#411 looks similar.