[widgets][algorithmeditor] Ensure generated name is schema compliant

beat/editor/widgets/algorithmeditor.py

@@ -691,13 +691,13 @@ class AlgorithmEditor(AbstractAssetEditor):
         self.add_result_button.clicked.connect(self.__onAddResult)
 
     def __get_free_name(self, widget_list):
-        name = "Change Me"
+        name = "Change_Me"
         i = 1
         restart = True
         while restart:
             for widget in widget_list:
                 if widget.name() == name:
-                    name = f"Change Me {i}"
+                    name = f"Change_Me_{i}"
                     i += 1
                     break
             else: