Fix potential exception in KeepOldest split brain strategy #3272
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If remaining and unreachable lists are empty an exception will be encountered as soon as .First() is executed to try to find the oldest node
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I have found another issue when attempting to use KeepOldest strategy when sometimes the remaining and unreachable lists can be empty with an exception being generated due to the use of .First().
I have also removed some else statements Resharper pointed out were unnecessary.