Fix for bug ONOS-330:
Add missing "null" checks for IntentService.getIntentState()

Change-Id: Idd574227636f6cdd3a0dbae4c753ada6157e04e1
diff --git a/cli/src/main/java/org/onlab/onos/cli/net/IntentsListCommand.java b/cli/src/main/java/org/onlab/onos/cli/net/IntentsListCommand.java
index 0f24647..7f84207 100644
--- a/cli/src/main/java/org/onlab/onos/cli/net/IntentsListCommand.java
+++ b/cli/src/main/java/org/onlab/onos/cli/net/IntentsListCommand.java
@@ -126,6 +126,9 @@
             // Collect the summary for each intent type intents
             for (Intent intent : intents) {
                 IntentState intentState = service.getIntentState(intent.id());
+                if (intentState == null) {
+                    continue;
+                }
 
                 // Update the summary for all Intents
                 summaryAll.update(intentState);