gui: work around alacrittys awful format (i love you, but this is nuts)

alacritty_config_gui.py

@@ -483,7 +483,9 @@ class ConfigWidget(QtWidgets.QWidget):
             if not name:
                 return self.widget_value(widget)
             elif type(widget) is dict:
-                state[name] = self.widgets_to_state(widget)
+                val = self.widgets_to_state(widget)
+                if len(val):
+                    state[name] = val
             else:
                 val = self.widget_value(widget)
                 if val is not None: