read terminal uuid in Terminal and do not write terminal uuid from TerminalData, because Terminal just reads it, only PartTerminal writes the uuid

sources/editor/graphicspart/partterminal.cpp

@@ -72,6 +72,9 @@ bool PartTerminal::fromXmlPriv(const QDomElement &xml_elmt) {
 */
 void PartTerminal::toXmlPriv(QDomElement& e) const {
 
+    if (!d->m_uuid.isNull())
+        e.setAttribute("uuid", d->m_uuid.toString());
+
     d->m_pos = pos();
 
     QDomDocument doc = e.ownerDocument();