Fix null pointer exception when deviceId is temporarily absent on startup

Change-Id: I475840a593156b63443cf008e458ad02cf4dc78a
diff --git a/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java b/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
index 0564fae..bf8ba59 100644
--- a/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
+++ b/core/common/src/test/java/org/onosproject/store/trivial/SimpleGroupStore.java
@@ -516,7 +516,7 @@
                 }
                 getPendingGroupKeyTable(deviceId).clear();
             } else {
-                if (deviceAuditStatus.get(deviceId)) {
+               if (deviceAuditStatus.getOrDefault(deviceId, false)) {
                     log.debug("deviceInitialAuditCompleted: Clearing AUDIT "
                             + "status for device {}", deviceId);
                     deviceAuditStatus.put(deviceId, false);