fix(jans-config-api): GET configuser exception

[moabu]

Request:
GET for /jans-config-api/mgt/configuser

Stacktrace:

26-09 14:56:15.490 INFO  jans.configapi.filters.LoggingFilter LoggingFilter.java:33- ****Request GET /configuser from IP 176.199.211.208
2022-09-26 14:56:15.497:WARN :oejs.HttpChannel:qtp762476028-13: handleException /jans-config-api/mgt/configuser com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.ArrayIndexOutOfBoundsException) (through reference chain: io.jans.configapi.plugin.mgt.rest.UserResource$UserPagedResult["entries"]->java.util.ArrayList[0]->io.jans.configapi.plugin.mgt.model.user.CustomUser["customAttributes"]->java.util.ArrayList[1]->io.jans.orm.model.base.CustomObjectAttribute["displayValue"])

[pujavs]

Working fine in LDAP but throwing the above error in MySQL. Attached logs and testing details
Analysing further
LDAP Testing with latest code:

MySQL Testing with latest code:

[pujavs]

Issue: java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
at java.base/java.util.Arrays$ArrayList.get(Arrays.java:4351)
at io.jans.orm.model.base.CustomObjectAttribute.getDisplayValue(CustomObjectAttribute.java:95)
at io.jans.configapi.plugin.mgt.rest.UserResource.getUsers(UserResource.java:111)
at io.jans.configapi.plugin.mgt.rest.UserResource$Proxy$_$$WeldSubclass.getUsers(Unknown Source)
at io.jans.configapi.plugin.mgt.rest.UserResource$Proxy$$$_WeldClientProxy.getUsers(Unknown Source)

Complete Logs: 2022_09_29.jetty_error_2_complete.log

Analysis: CustomObjectAttribute values list attribute element accessed without checking length.

Fix: Added length check before accessing CustomObjectAttribute values list elements

Module: jans-orm module

Testing on My-SQL env: