specify exceptions

Author: jdwpeterson

dashboards/component/stat/serializers.py

@@ -30,7 +30,7 @@ def __post_init__(self):
         else:
             try:
                 self.change = (self.value - self.previous) / self.previous * 100
-            except:  # noqa
+            except (TypeError, ZeroDivisionError):
                 self.change = None