fix: change the default to not an english language learner. Blank columns are treated as Not ELL. Only mark student as an english language learner if it's marked as such. Columns marked with 'NA' are treated as unknown

app/models/ell.rb

@@ -6,12 +6,12 @@ class Ell < ApplicationRecord
   friendly_id :designation, use: [:slugged]
   def self.to_designation(ell)
     case ell
-    in /lep student 1st year|LEP student not 1st year|EL Student First Year|LEP\s*student/i
+    in /lep student 1st year|LEP student not 1st year|EL Student First Year|LEP\s*student|true/i
       "ELL"
-    in /Does not apply/i
-      "Not ELL"
-    else
+    in /^NA$|^#NA$/i
       "Unknown"
+    else
+      "Not ELL"
     end
   end
 end