Android: Remove unneeded null validation

Change-Id: Iede5baafd13f8b1a997336d843004e6423985616
Reviewed-by: BogDan Vatra <bogdan@kde.org>
QmlPuppet: Pass const strings by reference

Change-Id: I6bf60d6484f13817dcbe36a4bfc099f3edf7559c
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
Bookmarks: Pass const value by references

Change-Id: If2467074478b1ee108ae46b39cdcc3b1a5c6f830
Reviewed-by: Eike Ziller <eike.ziller@digia.com>