fix(admin-ui): error in displaying license details

[duttarnab]

Getting the following error when displaying license details when company_name, email, first_name or last_name associated with the license is null.

29-10 07:41:41.395 INFO  [qtp366004251-15] [ca.plugin.adminui.service.license.LicenseDetailsService] (LicenseDetailsService.java:418) - license details request status code: 200
29-10 07:41:41.397 ERROR [qtp366004251-15] [ca.plugin.adminui.service.license.LicenseDetailsService] (LicenseDetailsService.java:443) - Error in fetching license details. Check logs for further details.
java.lang.ClassCastException: class jakarta.json.JsonValueImpl cannot be cast to class jakarta.json.JsonString (jakarta.json.JsonValueImpl and jakarta.json.JsonString are in unnamed module of loader org.eclipse.jetty.webapp.WebAppClassLoader @46cdf8bd)
        at org.glassfish.json.JsonObjectBuilderImpl$JsonObjectImpl.getJsonString(JsonObjectBuilderImpl.java:254) ~[jakarta.json-2.0.1.jar:2.0.1]
        at org.glassfish.json.JsonObjectBuilderImpl$JsonObjectImpl.getString(JsonObjectBuilderImpl.java:259) ~[jakarta.json-2.0.1.jar:2.0.1]
        at io.jans.ca.plugin.adminui.service.license.LicenseDetailsService.getLicenseDetails(LicenseDetailsService.java:430) ~[gluu-flex-admin-ui-plugin.jar:?]
        at io.jans.ca.plugin.adminui.rest.license.LicenseResource.details(LicenseResource.java:217) ~[gluu-flex-admin-ui-plugin.jar:?]
        at io.jans.ca.plugin.adminui.rest.license.LicenseResource$Proxy$_$$_WeldSubclass.details(Unknown Source) ~[gluu-flex-admin-ui-plugin.jar:?]
        at io.jans.ca.plugin.adminui.rest.license.LicenseResource$Proxy$_$$_WeldClientProxy.details(Unknown Source) ~[gluu-flex-admin-ui-plugin.jar:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:170) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:130) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:660) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:524) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:474) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:476) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:434) ~[resteasy-core-6.0.3.Final.jar:6.0.3.Final]