HBASE-29186 RegionPlanConditionals can produce a null pointer

[rmdmattingly]

The value of this lookup can be null, and we can't pass a null value to Arrays#stream:

java.lang.NullPointerException: Cannot read the array length because "array" is null
  at java.util.Arrays.stream(Arrays.java:5559) ~[?:?]
  at org.apache.hadoop.hbase.master.balancer.RegionPlanConditional.isViolating(RegionPlanConditional.java:103) ~[hbase-server-2.6-hubspot-SNAPSHOT.jar:2.6-hubspot-SNAPSHOT]

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 27s		Docker mode activated.
-0 ⚠️	yetus	0m 3s		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 16s		master passed
+1 💚	compile	0m 15s		master passed
+1 💚	javadoc	0m 12s		master passed
+1 💚	shadedjars	5m 54s		branch has no errors when building our shaded downstream artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	3m 4s		the patch passed
+1 💚	compile	0m 15s		the patch passed
+1 💚	javac	0m 15s		the patch passed
+1 💚	javadoc	0m 11s		the patch passed
+1 💚	shadedjars	5m 53s		patch has no errors when building our shaded downstream artifacts.
			_ Other Tests _
+1 💚	unit	7m 40s		hbase-balancer in the patch passed.
		28m 10s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6796/1/artifact/yetus-jdk17-hadoop3-check/output/Dockerfile
GITHUB PR	#6796
Optional Tests	javac javadoc unit compile shadedjars
uname	Linux 1cd9344a8062 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 / e0f2c3f
Default Java	Eclipse Adoptium-17.0.11+9
Test Results	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6796/1/testReport/
Max. process+thread count	268 (vs. ulimit of 30000)
modules	C: hbase-balancer U: hbase-balancer
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6796/1/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 26s		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.
+1 💚	hbaseanti	0m 0s		Patch does not have any anti-patterns.
			_ master Compile Tests _
+1 💚	mvninstall	3m 16s		master passed
+1 💚	compile	0m 25s		master passed
+1 💚	checkstyle	0m 10s		master passed
+1 💚	spotbugs	0m 24s		master passed
+1 💚	spotless	0m 46s		branch has no errors when running spotless:check.
			_ Patch Compile Tests _
+1 💚	mvninstall	2m 59s		the patch passed
+1 💚	compile	0m 24s		the patch passed
+1 💚	javac	0m 24s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 9s		the patch passed
+1 💚	spotbugs	0m 30s		the patch passed
+1 💚	hadoopcheck	11m 51s		Patch does not cause any errors with Hadoop 3.3.6 3.4.0.
+1 💚	spotless	0m 44s		patch has no errors when running spotless:check.
			_ Other Tests _
+1 💚	asflicense	0m 10s		The patch does not generate ASF License warnings.
		29m 46s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6796/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#6796
Optional Tests	dupname asflicense javac spotbugs checkstyle codespell detsecrets compile hadoopcheck hbaseanti spotless
uname	Linux 2b51e1fd55cb 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 / e0f2c3f
Default Java	Eclipse Adoptium-17.0.11+9
Max. process+thread count	82 (vs. ulimit of 30000)
modules	C: hbase-balancer U: hbase-balancer
Console output	https://ci-hbase.apache.org/job/HBase-PreCommit-GitHub-PR/job/PR-6796/1/console
versions	git=2.34.1 maven=3.9.8 spotbugs=4.7.3
Powered by	Apache Yetus 0.15.0 https://yetus.apache.org

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