fix NPE

Author: ltamaster

src/main/groovy/com/rundeck/plugins/ansible/ansible/AnsibleRunnerContextBuilder.java

@@ -1117,7 +1117,7 @@ public List<String> getListNodesKeyPath(){
 
 
     public Boolean generateInventoryNodesAuth() {
-        Boolean generateInventoryNodesAuth = null;
+        boolean generateInventoryNodesAuth = false;
 
         log.debug("Resolving property ANSIBLE_GENERATE_INVENTORY_NODES_AUTH");
         log.debug("Property key: {}", AnsibleDescribable.ANSIBLE_GENERATE_INVENTORY_NODES_AUTH);