Enforce that group/entry uuid is set when writing a database.

src/core/Database.cpp

@@ -29,6 +29,7 @@ Database::Database()
 {
     m_metadata = new Metadata(this);
     setRootGroup(new Group());
+    rootGroup()->setUuid(Uuid::random());
 
     m_cipher = KeePass2::CIPHER_AES;
     m_compressionAlgo = CompressionGZip;

src/format/KeePass2XmlWriter.cpp

@@ -169,6 +169,8 @@ void KeePass2XmlWriter::writeRoot()
 
 void KeePass2XmlWriter::writeGroup(const Group* group)
 {
+    Q_ASSERT(!group->uuid().isNull());
+
     m_xml.writeStartElement("Group");
 
     writeUuid("UUID", group->uuid());
@@ -237,6 +239,8 @@ void KeePass2XmlWriter::writeDeletedObject(const DeletedObject& delObj)
 
 void KeePass2XmlWriter::writeEntry(const Entry* entry)
 {
+    Q_ASSERT(!entry->uuid().isNull());
+
     m_xml.writeStartElement("Entry");
 
     writeUuid("UUID", entry->uuid());