HBASE-29038 Fix NPE in processRS.jsp due to missing MBean value

[aaronbee]

No description provided.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 27s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ master Compile Tests _
+1 💚	mvninstall	3m 6s		master passed
+1 💚	spotless	0m 45s		branch has no errors when running spotless:check.
			_ Patch Compile Tests _
+1 💚	mvninstall	2m 52s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	spotless	0m 41s		patch has no errors when running spotless:check.
			_ Other Tests _
+1 💚	asflicense	0m 10s		The patch does not generate ASF License warnings.
		9m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6556/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#6556
Optional Tests	dupname asflicense javac codespell detsecrets spotless
uname	Linux 24bf095091fa 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 399cba5
Default Java	Eclipse Adoptium-17.0.11+9
Max. process+thread count	83 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6556/1/console
versions	git=2.34.1 maven=3.9.8
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[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		Docker mode activated.
-0 ⚠️	yetus	0m 2s		Unprocessed flag(s): --brief-report-file --spotbugs-strict-precheck --author-ignore-list --blanks-eol-ignore-file --blanks-tabs-ignore-file --quick-hadoopcheck
			_ Prechecks _
			_ master Compile Tests _
+1 💚	mvninstall	3m 18s		master passed
+1 💚	javadoc	0m 29s		master passed
			_ Patch Compile Tests _
+1 💚	mvninstall	2m 41s		the patch passed
+1 💚	javadoc	0m 27s		the patch passed
			_ Other Tests _
+1 💚	unit	185m 17s		hbase-server in the patch passed.
		196m 51s

Subsystem	Report/Notes
Docker	ClientAPI=1.47 ServerAPI=1.47 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6556/1/artifact/yetus-jdk17-hadoop3-check/output/Dockerfile
GITHUB PR	#6556
Optional Tests	javac javadoc unit
uname	Linux bc2022827495 5.4.0-200-generic #220-Ubuntu SMP Fri Sep 27 13:19:16 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/hbase-personality.sh
git revision	master / 399cba5
Default Java	Eclipse Adoptium-17.0.11+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6556/1/testReport/
Max. process+thread count	5171 (vs. ulimit of 30000)
modules	C: hbase-server U: hbase-server
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6556/1/console
versions	git=2.34.1 maven=3.9.8
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[guluo2016]

Is it better to display 0 if it's null? I'm not sure, maybe we can hear other people's opinions?

<th>JvmPauseMonitor Count </th> , Can you also remove this space in line65?