Modifying the es5 and es6 templates for javascript to handle default values

for required fields better. This change ensures the required field isn't
overridden with undefined when the object is constructed - especially through
a chain of constructFromObject calls..

Author: tray2100

modules/openapi-generator/src/main/resources/Javascript/es6/partial_model_generic.mustache

@@ -26,7 +26,7 @@ class {{classname}} {{#parent}}{{^parentModel}}{{#vendorExtensions.x-is-array}}e
      * Only for internal use.
      */{{/emitJSDoc}}
     static initialize(obj{{#vendorExtensions.x-all-required}}, {{name}}{{/vendorExtensions.x-all-required}}) { {{#vars}}{{#required}}
-        obj['{{baseName}}'] = {{name}};{{/required}}{{/vars}}
+        {{#defaultValue}}obj['{{baseName}}'] = {{name}} || {{{defaultValue}}};{{/defaultValue}}{{^defaultValue}}obj['{{baseName}}'] = {{name}};{{/defaultValue}}{{/required}}{{/vars}}
     }
 
     {{#emitJSDoc}}/**

modules/openapi-generator/src/main/resources/Javascript/partial_model_generic.mustache

@@ -33,7 +33,12 @@
     {{/useInheritance}}
     {{#vars}}
     {{#required}}
+    {{#defaultValue}}
+    _this['{{baseName}}'] = {{name}} || {{{defaultValue}}};
+    {{/defaultValue}}
+    {{^defaultValue}}
     _this['{{baseName}}'] = {{name}};
+    {{/defaultValue}}
     {{/required}}
     {{/vars}}
     {{#parent}}

samples/client/petstore/javascript-es6/src/model/Category.js

@@ -35,7 +35,7 @@ class Category {
      * Only for internal use.
      */
     static initialize(obj, name) { 
-        obj['name'] = name;
+        obj['name'] = name || 'default-name';
     }
 
     /**

samples/client/petstore/javascript-promise-es6/src/model/Category.js

@@ -35,7 +35,7 @@ class Category {
      * Only for internal use.
      */
     static initialize(obj, name) { 
-        obj['name'] = name;
+        obj['name'] = name || 'default-name';
     }
 
     /**