[modules] weather & github: Protect against missing data

If data cannot be retrieved for some reason (be pretty generous about
that by catching generic exceptions), instead of terminating the whole
status bar, simply report unknown data.

see #110

bumblebee/modules/weather.py

@@ -70,5 +70,7 @@ class Module(bumblebee.engine.Module):
                 self._valid = True
             except RequestException:
                 self._valid = False
+            except Exception:
+                self._valid = False
 
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