YARN-10829. Follow up: Adding null checks before merging ResourceUsage Report

[akshatb1]

• Adding null checks before merging ResourceUsage Report. Follow up from previous PR: YARN-10829. Support getApplications API in FederationClientInterceptor #3135
• Unit tests are running successfully on dev machine.

[akshatb1]

@bibinchundatt: Could you kindly help in reviewing this PR? Thanks.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
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+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	31m 28s		trunk passed
+1 💚	compile	0m 34s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
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+1 💚	spotbugs	0m 51s		trunk passed
+1 💚	shadedclient	14m 6s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 25s		the patch passed
+1 💚	compile	0m 23s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	0m 23s		the patch passed
+1 💚	compile	0m 21s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	0m 21s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 15s		the patch passed
+1 💚	mvnsite	0m 23s		the patch passed
+1 💚	javadoc	0m 20s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 18s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	0m 48s		the patch passed
+1 💚	shadedclient	13m 47s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 31s		hadoop-yarn-server-router in the patch passed.
+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		72m 5s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3252/1/artifact/out/Dockerfile
GITHUB PR	#3252
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versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 48s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+1 💚	@author	0m 1s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	31m 58s		trunk passed
+1 💚	compile	0m 31s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	compile	0m 29s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	checkstyle	0m 21s		trunk passed
+1 💚	mvnsite	0m 29s		trunk passed
+1 💚	javadoc	0m 30s		trunk passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 22s		trunk passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	0m 48s		trunk passed
+1 💚	shadedclient	14m 33s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 25s		the patch passed
+1 💚	compile	0m 23s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javac	0m 23s		the patch passed
+1 💚	compile	0m 21s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	javac	0m 21s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 14s		the patch passed
+1 💚	mvnsite	0m 23s		the patch passed
+1 💚	javadoc	0m 19s		the patch passed with JDK Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04
+1 💚	javadoc	0m 19s		the patch passed with JDK Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
+1 💚	spotbugs	0m 48s		the patch passed
+1 💚	shadedclient	14m 14s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 28s		hadoop-yarn-server-router in the patch passed.
+1 💚	asflicense	0m 31s		The patch does not generate ASF License warnings.
		72m 58s

Subsystem	Report/Notes
Docker	ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3252/2/artifact/out/Dockerfile
GITHUB PR	#3252
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell
uname	Linux ffd4e293492d 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/bin/hadoop.sh
git revision	trunk / c969881
Default Java	Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.11+9-Ubuntu-0ubuntu2.20.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_292-8u292-b10-0ubuntu1~20.04-b10
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3252/2/testReport/
Max. process+thread count	663 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-3252/2/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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