Set dummy sgvDate in PumpStatusEvent to avoid crash on first run.

app/src/main/java/info/nightscout/android/utils/DataStore.java

@@ -26,6 +26,7 @@ public class DataStore {
 
             // set some initial dummy values
             PumpStatusEvent dummyStatus = new PumpStatusEvent();
+            dummyStatus.setSgvDate(new Date());
 
             // bypass setter to avoid dealing with a real Realm object
             instance.lastPumpStatus = dummyStatus;