#717: Disabling advanced weather crashes the sim Protect from a NULL-pointer segfault in SGCloudField::removeCloudFromTree when disabling advanced weather (may just fix a symptom).
#717: Disabling advanced weather crashes the sim
Protect from a NULL-pointer segfault in SGCloudField::removeCloudFromTree
when disabling advanced weather (may just fix a symptom).

slowriot/simgear,slowriot/simgear