Always leave hint mode

- Also handle invalid URLs properly through catching the QtValueError

qutebrowser/mainwindow/tabbedbrowser.py

@@ -584,14 +584,18 @@ class TabbedBrowser(QWidget):
     @pyqtSlot()
     def on_cur_load_started(self):
         """Leave insert/hint mode when loading started."""
+        try:
+            url = self.current_url()
+        except qtutils.QtValueError:
+            url = None
         if config.instance.get('input.insert_mode.leave_on_load',
-                               url=self.current_url()):
+                               url=url):
             modeman.leave(self._win_id, usertypes.KeyMode.insert,
                           'load started', maybe=True)
-            modeman.leave(self._win_id, usertypes.KeyMode.hint,
-                          'load started', maybe=True)
         else:
             log.modes.debug("Ignoring leave_on_load request due to setting.")
+        modeman.leave(self._win_id, usertypes.KeyMode.hint,
+                        'load started', maybe=True)
 
     @pyqtSlot(browsertab.AbstractTab, str)
     def on_title_changed(self, tab, text):