Add fix to check for product_id of '2041'.
The issue was that Waterloo's API would provide a product_id of '2041' to
products which were not 'Falafel Marinara'. This led to products such has
'Swedish Meatballs' displaying incorrect nutritional information.
TODO: - fix diet_types to use null instead of "null" as a string.
      - add a more intelligent check to check for this problem occuring on
	other items not just with '2041'.
      - add calculated % values that are not provided.