Use 'normal' severity naming by default if no system settings have been set

Author: patriknordlen

dojo/models.py

@@ -728,7 +728,7 @@ def severity_display(self):
                 return self.severity
 
         except:
-            return self.numerical_severity
+            return self.severity
 
     def get_breadcrumbs(self):
         bc = self.test.get_breadcrumbs()