minor, fix NPE on diag

Project: http://git-wip-us.apache.org/repos/asf/kylin/repo
Commit: http://git-wip-us.apache.org/repos/asf/kylin/commit/14be33f8
Tree: http://git-wip-us.apache.org/repos/asf/kylin/tree/14be33f8
Diff: http://git-wip-us.apache.org/repos/asf/kylin/diff/14be33f8

Branch: refs/heads/1.5.x-HBase1.x
Commit: 14be33f8f16d20bb18500934d56272a30face1b8
Parents: de2f754
Author: lidongsjtu <lid...@apache.org>
Authored: Tue May 3 17:30:06 2016 +0800
Committer: lidongsjtu <lid...@apache.org>
Committed: Tue May 3 17:30:06 2016 +0800

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 tool/src/main/java/org/apache/kylin/tool/ToolUtil.java | 2 ++
 1 file changed, 2 insertions(+)
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http://git-wip-us.apache.org/repos/asf/kylin/blob/14be33f8/tool/src/main/java/org/apache/kylin/tool/ToolUtil.java
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diff --git a/tool/src/main/java/org/apache/kylin/tool/ToolUtil.java 
b/tool/src/main/java/org/apache/kylin/tool/ToolUtil.java
index aa8810c..494f4fe 100644
--- a/tool/src/main/java/org/apache/kylin/tool/ToolUtil.java
+++ b/tool/src/main/java/org/apache/kylin/tool/ToolUtil.java
@@ -50,6 +50,8 @@ public class ToolUtil {
             final String metaStoreName = 
KylinConfig.getInstanceFromEnv().getMetadataUrlPrefix();
             final HTableDescriptor desc = 
hbaseAdmin.getTableDescriptor(TableName.valueOf(metaStoreName));
             return desc.getValue(HBaseConnection.HTABLE_UUID_TAG);
+        } catch (Exception e) {
+            return null;
         }
     }
 

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