Fix: add NULL check in cJSON_InsertItemInArray

[hsuk04]

Description of PR

Applying a fix from the original codebase that has not been applied here yet.
This adds a NULL check in cJSON_InsertItemInArray.

Referenced from the original commit here:
DaveGamble/cJSON@60ff122

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	40m 15s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
-1 ❌	mvninstall	37m 25s	/branch-mvninstall-root.txt	root in trunk failed.
+1 💚	compile	1m 22s		trunk passed
+1 💚	mvnsite	0m 50s		trunk passed
+1 💚	shadedclient	74m 14s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 36s		the patch passed
+1 💚	compile	1m 13s		the patch passed
-1 ❌	cc	1m 13s	/results-compile-cc-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-nodemanager.txt	hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-nodemanager generated 3 new + 51 unchanged - 0 fixed = 54 total (was 51)
+1 💚	golang	1m 13s		the patch passed
+1 💚	javac	1m 13s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 38s		the patch passed
+1 💚	shadedclient	34m 22s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	28m 12s		hadoop-yarn-server-nodemanager in the patch passed.
+1 💚	asflicense	0m 40s		The patch does not generate ASF License warnings.
		181m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.50 ServerAPI=1.50 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7741/1/artifact/out/Dockerfile
GITHUB PR	#7741
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell detsecrets golang
uname	Linux 3c264c0264b7 5.15.0-136-generic #147-Ubuntu SMP Sat Mar 15 15:53:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 5355060
Default Java	Red Hat, Inc.-1.8.0_412-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7741/1/testReport/
Max. process+thread count	700 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7741/1/console
versions	git=2.9.5 maven=3.6.3
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