Set name directly in metadata when clearing

Because the setName function checks if the name is equal to the previous name, but at that point the previous name doesn't exist.

Contributes to issue CURA-4243.

plugins/XmlMaterialProfile/XmlMaterialProfile.py

@@ -386,8 +386,10 @@ class XmlMaterialProfile(InstanceContainer):
                     first.append(element)
 
     def clearData(self):
-        self._metadata = {"id": self.getId()}
-        self.setName("")
+        self._metadata = {
+            "id": self.getId(),
+            "name": ""
+        }
         self._definition = None
         self._instances = {}
         self._read_only = False