ContactList: action null pointer exception fixed.

app/src/main/java/com/xabber/android/ui/ContactList.java

@@ -208,6 +208,7 @@ public class ContactList extends ManagedActivity implements OnChoosedListener, O
 	@Override
 	protected void onResume() {
 		super.onResume();
+        if (action != null) {
             switch (action) {
                 case ContactList.ACTION_ROOM_INVITE:
                 case Intent.ACTION_SEND:
@@ -247,6 +248,7 @@ public class ContactList extends ManagedActivity implements OnChoosedListener, O
                     }
                     break;
                 }
+            }
         }
 		if (Application.getInstance().doNotify()) {
 			if (SettingsManager.bootCount() > 2