MinorPlanets and Comets don't get selection pointers

Affects: MinorPlanet objects & Comet objects which have been added to SolarSystem using the Solar System Edtior plugin.
When these objects are selected (e.g. search dialog used to select them), no pointer is drawn, which is done for other planetary bodies.

Problem appears to be that when StelObjectMgr::getSelectedObject is called in drawPointer, it returns an empty list because the object type is not "Planet". See SolarSystem::drawPointer, specifically SolarSystem.cpp:152.

Two possible solutions (I would like feedback on which is preferred:

1. MinorPlanet::getType() and Comet::getType() return "Planet" (which is their parent class)
2. SolarSystem::drawPointer does three calls to StelObjectMgr::getSelectedObject, one for "Planet", one for "MinorPlanet" and one for "Comet", appending results to list before iterating over list.

Comments?