[core/config] Allow modules to be hidden when in critical/error state

When a module is in critical state, the user can now hide the module
(e.g. if pulseaudio fails to load).

fixes #746

bumblebee_status/core/output.py

@@ -216,6 +216,8 @@ class i3(object):
                     continue
             if module.hidden():
                 continue
+            if "critical" in widget.state() and self.__config.errorhide(widget.module.name):
+                continue
             blocks.extend(self.separator_block(module, widget))
             blocks.append(self.__content_block(module, widget))
             core.event.trigger("next-widget")