Revert "HBASE-27068 NPE occurs when the active master has not yet been elected (apache#4474)"

This reverts commit 8260d6c.

Author: wenwj0

hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/master/BackupMasterStatusTmpl.jamon

@@ -24,13 +24,12 @@ java.util.*;
 org.apache.hadoop.hbase.ServerName;
 org.apache.hadoop.hbase.ClusterMetrics;
 org.apache.hadoop.hbase.master.HMaster;
-org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
 </%import>
 <%if (!master.isActiveMaster()) %>
     <%java>
     ServerName active_master = master.getActiveMaster().orElse(null);
-    Preconditions.checkState(active_master != null, "Failed to retrieve active master's ServerName!");
-    int activeInfoPort = master.getActiveMasterInfoPort();
+    assert active_master != null : "Failed to retrieve active master's ServerName!";
+    int activeInfoPort = active_master == null ? 0 : master.getActiveMasterInfoPort();
     </%java>
     <div class="row inner_header">
         <div class="page-header">