Add NilClass#blank? method, returning true

gorilla-patch.gemspec

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 Gem::Specification.new do |s|
 	s.name          = 'gorilla-patch'
-	s.version       = '2.1.0'
+	s.version       = '2.1.1'
 	s.date          = Date.today.to_s
 	s.summary       = 'Refining core classes'
 	s.description   = 'Refine Ruby Core classes with methods like Active Support.'

lib/gorilla-patch/blank.rb

@@ -9,6 +9,12 @@ def blank?
 			end
 		end
 
+		refine NilClass do
+			def blank?
+				true
+			end
+		end
+
 		[Array, Hash].each do |klass|
 			refine klass do
 				def reject_blank_strings!

spec/gorilla-patch/blank_spec.rb

@@ -10,6 +10,10 @@
 		it { expect('  a  '.blank?).to be false }
 	end
 
+	describe NilClass, '#blank?' do
+		it { expect(nil.blank?).to be true }
+	end
+
 	describe Array do
 		let(:array) { [1, nil, '', 'a', [''], {}] }