Prompt user when one or more topics in the rosbag cannot be loaded  * previous behaviour: the bag load was aborted  * with this patch: prompt user whether or not to    * skip this problematic topic and continue loading    * skip this and other problematic topics that may arise when loading    * abort the load
Prompt user when one or more topics in the rosbag cannot be loaded
 * previous behaviour: the bag load was aborted
 * with this patch: prompt user whether or not to
   * skip this problematic topic and continue loading
   * skip this and other problematic topics that may arise when loading
   * abort the load

The patch addresses a real life example when some of the ros messages are created
from ROS-matlab, and therefore suffers from a bug related to a bad message description
E.g. see https://github.com/rosjava/rosjava_bootstrap/issues/16

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