Catching one more edge case

lib/linguist/language.rb

@@ -242,6 +242,7 @@ module Linguist
     #
     # Returns the Language or nil if none was found.
     def self.[](name)
+      return nil if name.to_s.empty?
       name && (@index[name.downcase] || @index[name.split(',').first.downcase])
     end
 

test/test_language.rb

@@ -278,6 +278,7 @@ class TestLanguage < Minitest::Test
   def test_doesnt_blow_up_with_blank_lookup
     assert_equal nil, Language.find_by_alias('')
     assert_equal nil, Language.find_by_name(nil)
+    assert_equal nil, Language[""]
   end
 
   def test_name