Meteor Showers plugin crashes when I select an event

[Marcos Cardinot]

test case:
1-load plugin;
2-Alt+M; config to showActiveRadiantsOnly + enableWhenStartUp; save config as default;
3-restart stellarium
4-Alt+M; Search Events;
5-Select an event;
-->crash

[Marcos Cardinot (cardinot)]

problem:
When the plugin is loaded just displaying active radiants, all inactive radiants non-exists yet. So, Stellarium crashes if I select a radiant that's not been created...

solution:
We could make that all radiants are always drawn in their construction, and it'd ensures that all objects exist.

[Marcos Cardinot (cardinot)]

fixed in the revision #6693