catch float ValueError default -1

modules/ui_loadsave.py

@@ -51,7 +51,10 @@ class UiLoadsave:
                 if isinstance(x, gr.Textbox) and field == 'value':  # due to an undersirable behavior of gr.Textbox, if you give it an int value instead of str, everything dies
                     saved_value = str(saved_value)
                 elif isinstance(x, gr.Number) and field == 'value':
-                    saved_value = float(saved_value)
+                    try:
+                        saved_value = float(saved_value)
+                    except ValueError:
+                        saved_value = -1
 
                 setattr(obj, field, saved_value)
                 if init_field is not None: