People rely on this method raising NotImplementError and working with no arguments

app/models/report/filter/base.rb

@@ -56,7 +56,7 @@ class Report::Filter
       super
     end
 
-    def self.available_values(user)
+    def self.available_values(params = {})
       raise NotImplementedError, "subclass responsibility"
     end
 
@@ -122,4 +122,4 @@ class Report::Filter
       end
     end
   end
-end
+end