HBASE-30142 Resolve NPE while running recoverUnknown command because null RegionLocation#8347
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virajjasani
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MasterRpcServices.scheduleSCPsForUnknownServers() has no null guard before calling isServerUnknown(). With the old code, regions with null serverName (OFFLINE/FAILED_OPEN in-between state) would spuriously trigger a ServerCrashProcedure. The fix prevents that.