Oops, fix bug when loading species with no alt styles in the Studio

app/services/neopets/nc_mall.rb

@@ -65,7 +65,10 @@ module Neopets::NCMall
 
 				begin
 					data = JSON.parse(response.read).deep_symbolize_keys
-					data.fetch(:styles).values
+
+					# HACK: styles is a hash, unless it's empty, in which case it's an
+					#       array? Weird. Normalize this by converting to hash.
+					data.fetch(:styles).to_h.values
 				rescue JSON::ParserError, KeyError
 					raise UnexpectedResponseFormat
 				end

spec/services/nc_mall_spec.rb

@@ -55,6 +55,15 @@ RSpec.describe Neopets::NCMall, type: :model do
 			)
 		end
 
+		it "handles the NC Mall's odd API behavior for zero styles" do
+			stub_styles_request.to_return(
+				# You'd think styles would be `{}` in this case, but it's `[]`. Huh!
+				body: '{"success":true,"styles":[]}',
+			)
+
+			expect(styles).to be_empty
+		end
+
 		it "raises an error if the request returns a non-200 status" do
 			stub_styles_request.to_return(status: 400)