Fix NPE during create agent requests (#131) (#132)

Author: GaneshSPatil

src/main/java/cd/go/contrib/elasticagent/KubernetesAgentInstances.java

@@ -162,6 +162,11 @@ public void refreshAll(PluginSettings properties) {
             }
         }
 
+        if (list == null) {
+            LOG.info("Did not find any running kubernetes pods.");
+            return;
+        }
+
         instances.clear();
         for (Pod pod : list.getItems()) {
             Map<String, String> podLabels = pod.getMetadata().getLabels();

src/main/java/cd/go/contrib/elasticagent/KubernetesPlugin.java

@@ -126,9 +126,10 @@ private void refreshInstancesForAllClusters(List<ClusterProfileProperties> listO
     private AgentInstances<KubernetesInstance> getAgentInstancesFor(ClusterProfileProperties clusterProfileProperties) throws Exception {
         KubernetesAgentInstances agentInstances = clusterSpecificAgentInstances.get(clusterProfileProperties.uuid());
 
-        //initalize agent instances if those are null
+        //initialize agent instances if those are null
         if (agentInstances == null) {
             refreshInstancesForCluster(clusterProfileProperties);
+            agentInstances = clusterSpecificAgentInstances.get(clusterProfileProperties.uuid());
         }
 
         return agentInstances;