Populate Swagger doc response with description field

Fixes #30
Changes default implementation to hold an empty description

Author: codymwalker

swagger/swagger.html

@@ -981,9 +981,7 @@
                     respCode = $(this).find(".node-swagger-respCode").val();
                 }
                 var desc = $(this).find(".node-swagger-description").val();
-                if (desc) {
-                    response.description = desc;
-                }
+                response.description = desc || "";
                 var properties = {};
                 $(this).find(".node-swagger-prop-list").children(".node-swagger-property-name-row").each(function() {
                     var property = {};

swagger/swagger.js

@@ -102,14 +102,18 @@ module.exports = function(RED) {
                             swaggerPart.responses = swagger.responses;
                         } else{
                             swaggerPart.responses = {
-                                default: {}
+                                default: {
+                                    description: ""
+                                }
                             };
                         }
                         node.status({});
                     } else{
                         swaggerPart.summary = node.name || (node.method+" "+url);
                         swaggerPart.responses = {
-                            default: {}
+                            default: {
+                                description: ""
+                            }
                         };
                         if(additionalParams){
                             swaggerPart.parameters = additionalParams.slice();