NPE Weldry System, cant click on outer planets

[pjfarland]

Per Hammer:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at mekhq.campaign.universe.Planet.getDisplayableSystemPosition(Planet.java:433)
at mekhq.gui.view.PlanetViewPanel.getPlanetPanel(PlanetViewPanel.java:181)
at mekhq.gui.view.PlanetViewPanel.initComponents(PlanetViewPanel.java:91)
at mekhq.gui.view.PlanetViewPanel.(PlanetViewPanel.java:74)
at mekhq.gui.MapTab.refreshPlanetView(MapTab.java:228)
at mekhq.gui.MapTab.actionPerformed(MapTab.java:281)
at mekhq.gui.PlanetarySystemMapPanel.lambda$1(PlanetarySystemMapPanel.java:728)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at mekhq.gui.PlanetarySystemMapPanel.notifyListeners(PlanetarySystemMapPanel.java:728)
at mekhq.gui.PlanetarySystemMapPanel.changeSelectedPlanet(PlanetarySystemMapPanel.java:538)
at mekhq.gui.PlanetarySystemMapPanel.access$19(PlanetarySystemMapPanel.java:536)
at mekhq.gui.PlanetarySystemMapPanel$5.mouseClicked(PlanetarySystemMapPanel.java:389)