HBASE-25332:fix One pontential NPE

[lujiefsi]

getData can return null at 

hbase/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java

Line 615 in 1726160

return null;

or

hbase/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java

Line 619 in 1726160

return null;

all its caller have null checker except at

hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java

Line 467 in 1726160

byte[] data = ZKUtil.getData(watcher, ZNodePaths.joinZNode(groupBasePath, znode));

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 28s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	hbaseanti	0m 0s	Patch does not have any anti-patterns.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
+1 💚	mvninstall	3m 50s	master passed
+1 💚	checkstyle	1m 4s	master passed
+1 💚	spotbugs	2m 1s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 24s	the patch passed
+1 💚	checkstyle	1m 4s	the patch passed
+1 💚	whitespace	0m 1s	The patch has no whitespace issues.
+1 💚	hadoopcheck	17m 18s	Patch does not cause any errors with Hadoop 3.1.2 3.2.1 3.3.0.
+1 💚	spotbugs	2m 10s	the patch passed
		_ Other Tests _
+1 💚	asflicense	0m 16s	The patch does not generate ASF License warnings.
		38m 47s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#2715
JIRA Issue	HBASE-25332
Optional Tests	dupname asflicense spotbugs hadoopcheck hbaseanti checkstyle
uname	Linux dd65bca89b91 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / e616541
Max. process+thread count	94 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/console
versions	git=2.17.1 maven=3.6.3 spotbugs=3.1.12
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
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-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+1 💚	mvninstall	4m 14s	master passed
+1 💚	compile	1m 7s	master passed
+1 💚	shadedjars	6m 36s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 42s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	4m 8s	the patch passed
+1 💚	compile	1m 13s	the patch passed
+1 💚	javac	1m 13s	the patch passed
+1 💚	shadedjars	6m 44s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 40s	the patch passed
		_ Other Tests _
+1 💚	unit	131m 13s	hbase-server in the patch passed.
		159m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/artifact/yetus-jdk11-hadoop3-check/output/Dockerfile
GITHUB PR	#2715
JIRA Issue	HBASE-25332
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 03adb9535a94 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / e616541
Default Java	AdoptOpenJDK-11.0.6+10
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/testReport/
Max. process+thread count	3865 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/console
versions	git=2.17.1 maven=3.6.3
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	1m 25s	Docker mode activated.
-0 ⚠️	yetus	0m 3s	Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --whitespace-eol-ignore-list --whitespace-tabs-ignore-list --quick-hadoopcheck
		_ Prechecks _
		_ master Compile Tests _
+1 💚	mvninstall	4m 59s	master passed
+1 💚	compile	1m 10s	master passed
+1 💚	shadedjars	8m 22s	branch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 46s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	3m 57s	the patch passed
+1 💚	compile	1m 16s	the patch passed
+1 💚	javac	1m 16s	the patch passed
+1 💚	shadedjars	8m 24s	patch has no errors when building our shaded downstream artifacts.
+1 💚	javadoc	0m 39s	the patch passed
		_ Other Tests _
+1 💚	unit	141m 55s	hbase-server in the patch passed.
		175m 24s

Subsystem	Report/Notes
Docker	ClientAPI=1.40 ServerAPI=1.40 base: https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/artifact/yetus-jdk8-hadoop3-check/output/Dockerfile
GITHUB PR	#2715
JIRA Issue	HBASE-25332
Optional Tests	javac javadoc unit shadedjars compile
uname	Linux 5f9a5702af23 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / e616541
Default Java	AdoptOpenJDK-1.8.0_232-b09
Test Results	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/testReport/
Max. process+thread count	4255 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2715/1/console
versions	git=2.17.1 maven=3.6.3
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[virajjasani]

+1