[modules/battery] Fix syntax error

see #221

bumblebee/modules/battery.py

@@ -105,8 +105,9 @@ class Module(bumblebee.engine.Module):
             state.append("AC")
         else:
             charge = ""
-            with open("{}/status".format(widget.name)) as f:
-                charge = f.read().strip()
+            try:
+                with open("{}/status".format(widget.name)) as f:
+                    charge = f.read().strip()
             except IOError:
                 pass
             if charge == "Discharging":

bumblebee/modules/spacer.py

@@ -17,6 +17,9 @@ class Module(bumblebee.engine.Module):
         )
         self._text = self.parameter("text", "")
 
+    def update(self, widgets):
+        raise Exception("test")
+
     def text(self, widget):
         return self._text