[TypeScriptAngular2Client] fixed unnecessary thrown unhandled exceptions with non 204 (http status code) but empty http responses. swagger-api#1334

Author: iain17

modules/swagger-codegen/src/main/resources/typescript-angular2/api.mustache

@@ -46,8 +46,11 @@ export class {{classname}} {
             .map((response: Response) => {
                 if (response.status === 204) {
                     return undefined;
-                } else {
+                }
+                try {
                     return response.json() || {};
+                }catch(e){
+                    return {};
                 }
             });
     }