Project medications also filters out medications for deleted subjects…

…, addresses #697.

app/models/concerns/medications.rb

@@ -6,7 +6,7 @@ module Medications
   included do
     # Relationships
     has_many :medication_variables, -> { current.order("position nulls last") }
-    has_many :medications, -> { current }
+    has_many :medications, -> { current.joins(:subject).merge(Subject.current) }
     has_many :medication_values
   end
 end