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Previously, calling s.IsLearner() when the local node is no longer a member panics. There was an attempt to fix this by first checking IsMemberExist(), but this is not a correct fix because the member could be removed between the two calls. Instead of panicking when the member was removed, IsLearner() should return false. A node which is not a member is also not a learner. There was a similar concurrency bug when accessing the IsLearner property of a member, which will panic with a nil pointer access error if the member is removed between the IsMemberExist() and Member() calls. Signed-off-by: Jan Schär <jan@monogon.tech>