Fix NPE before creating entity links during dynamic state management

This this aligns the call to `EntityLinkUtil#createEntityLinks` with the other places
by first checking if entity links are even enabled

Author: LoveMyOrange

modules/flowable-engine/src/main/java/org/flowable/engine/impl/dynamic/AbstractDynamicStateManager.java

@@ -1101,8 +1101,10 @@ protected ExecutionEntity createCallActivityInstance(CallActivity callActivity,
         }
 
         ExecutionEntity subProcessInstance = executionEntityManager.createSubprocessInstance(subProcessDefinition, parentExecution, businessKey, initialActivityId);
-        EntityLinkUtil.createEntityLinks(parentExecution.getProcessInstanceId(), parentExecution.getId(), callActivity.getId(),
-                subProcessInstance.getId(), ScopeTypes.BPMN);
+        if (processEngineConfiguration.isEnableEntityLinks()) {
+            EntityLinkUtil.createEntityLinks(parentExecution.getProcessInstanceId(), parentExecution.getId(), callActivity.getId(),
+                    subProcessInstance.getId(), ScopeTypes.BPMN);
+        }
         CommandContextUtil.getActivityInstanceEntityManager(commandContext).recordSubProcessInstanceStart(parentExecution, subProcessInstance);
 
         FlowableEventDispatcher eventDispatcher = processEngineConfiguration.getEventDispatcher();