Fix NPE in MissedCallNotifierImpl

Check to see if the caller info is null before trying to access its
contact display photo URI

Change-Id: I9461797074a6815b662bd7796fc3a4a6cbc558da
Fix: 34396500
Test: manual
diff --git a/src/com/android/server/telecom/ui/MissedCallNotifierImpl.java b/src/com/android/server/telecom/ui/MissedCallNotifierImpl.java
index 3b8e7e0..863c393 100644
--- a/src/com/android/server/telecom/ui/MissedCallNotifierImpl.java
+++ b/src/com/android/server/telecom/ui/MissedCallNotifierImpl.java
@@ -625,8 +625,10 @@
                                                                 "different handle.");
                                                 return;
                                             }
-                                            if (info.contactDisplayPhotoUri == null) {
-                                                // If there is no photo, just show the notification.
+                                            if (info == null ||
+                                                    info.contactDisplayPhotoUri == null) {
+                                                // If there is no photo or if the caller info is
+                                                // null, just show the notification.
                                                 CallInfo callInfo = callInfoFactory.makeCallInfo(
                                                         info, null, handle, date);
                                                 showMissedCallNotification(callInfo, userHandle);