Avoid HTTParty deprecation warnings on #nil?

lib/never_bounce/api/feature/require_attr.rb

@@ -18,8 +18,8 @@ module InstanceMethods
       # Require attribute to be set. Return attribute value.
       # @return [mixed]
       def require_attr(name)
-        send(name).tap do |_|
-          raise AttributeError, "Attribute must be set: #{name}" if _.nil?
+        send(name).tap do |value|
+          raise AttributeError, "Attribute must be set: #{name}" if value == nil
         end
       end
     end

spec/lib/never_bounce/api/feature/require_attr_spec.rb

@@ -21,5 +21,18 @@ def b
       r.a = "a"
       expect(r.b).to eq ["a", "b"]
     end
+
+    it "doesn't trip HTTParty's deprecation warning on #nil?" do
+      request = instance_double(HTTParty::Request, options: {})
+      response = instance_double(Net::HTTPResponse, body: nil, to_hash: {})
+      parsed_block = lambda { nil }
+
+      server_obj = HTTParty::Response.new(request, response, parsed_block)
+
+      r = klass.new
+      r.a = server_obj
+
+      expect { r.b }.not_to output(/DEPRECATION/).to_stderr
+    end
   end
 end; end; end