Check if class is whitelisted before actually trying to generate constructor (#339)

Author: Paweł Płazieński

typescript-generator-core/src/main/java/cz/habarta/typescript/generator/ext/RequiredPropertyConstructorExtension.java

@@ -74,16 +74,16 @@ public TsModel transformModel(SymbolTable symbolTable, TsModel model) {
 
     private TsBeanModel transformBean(TsBeanModel bean, TsModel model,
                                              Map<String, TsConstructorModel> generatedConstructors) {
+        if (classes != null && !classes.contains(bean.getOrigin().getCanonicalName())) {
+            return bean;
+        }
         if (!bean.isClass() || bean.getConstructor() != null) {
             return bean;
         }
         Optional<TsConstructorModel> constructorOption = createConstructor(bean, model, generatedConstructors);
         if (!constructorOption.isPresent()) {
             return bean;
         }
-        if (classes != null && !classes.contains(bean.getOrigin().getCanonicalName())) {
-            return bean;
-        }
         TsConstructorModel constructor = constructorOption.get();
         generatedConstructors.put(bean.getName().getFullName(), constructor);
         return bean.withConstructor(constructor);