feat: allow null emails

app/services/bulk_upload/lettings/year2022/row_parser.rb

@@ -513,7 +513,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.where("lower(email) = ?", field_112.downcase).first
+    @created_by ||= User.where("lower(email) = ?", field_112&.downcase).first
   end
 
   def duplicate_check_fields

app/services/bulk_upload/lettings/year2023/row_parser.rb

@@ -542,7 +542,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.where("lower(email) = ?", field_3.downcase).first
+    @created_by ||= User.where("lower(email) = ?", field_3&.downcase).first
   end
 
   def validate_uprn_exists_if_any_key_address_fields_are_blank

app/services/bulk_upload/sales/year2022/row_parser.rb

@@ -934,7 +934,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.where("lower(email) = ?", field_93.downcase).first
+    @created_by ||= User.where("lower(email) = ?", field_93&.downcase).first
   end
 
   def hhregres

app/services/bulk_upload/sales/year2023/row_parser.rb

@@ -1112,7 +1112,7 @@ private
   end
 
   def created_by
-    @created_by ||= User.where("lower(email) = ?", field_2.downcase).first
+    @created_by ||= User.where("lower(email) = ?", field_2&.downcase).first
   end
 
   def previous_la_known