[ts-ng2] add check whether header parameter is undefined or not (#5668)

Author: taxpon

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

@@ -115,7 +115,9 @@ export class {{classname}} {
         }
         {{/isListContainer}}
         {{^isListContainer}}
-        headers.set('{{baseName}}', String({{paramName}}));
+        if ({{paramName}} !== undefined && {{paramName}} !== null) {
+            headers.set('{{baseName}}', String({{paramName}}));
+        }
         {{/isListContainer}}
 
 {{/headerParams}}

samples/client/petstore-security-test/typescript-angular2/.swagger-codegen/VERSION

@@ -0,0 +1 @@
+2.2.3-SNAPSHOT

samples/client/petstore-security-test/typescript-angular2/api/FakeApi.ts

@@ -51,7 +51,7 @@ export class FakeApi {
                 if (response.status === 204) {
                     return undefined;
                 } else {
-                    return response.json();
+                    return response.json() || {};
                 }
             });
     }

samples/client/petstore/typescript-angular2/default/.swagger-codegen/VERSION

@@ -0,0 +1 @@
+2.2.3-SNAPSHOT

samples/client/petstore/typescript-angular2/default/api/PetApi.ts

@@ -242,7 +242,9 @@ export class PetApi {
         if (petId === null || petId === undefined) {
             throw new Error('Required parameter petId was null or undefined when calling deletePet.');
         }
-        headers.set('api_key', String(apiKey));
+        if (apiKey !== undefined && apiKey !== null) {
+            headers.set('api_key', String(apiKey));
+        }
 
         // to determine the Content-Type header
         let consumes: string[] = [

samples/client/petstore/typescript-angular2/npm/.swagger-codegen/VERSION

@@ -0,0 +1 @@
+2.2.3-SNAPSHOT

samples/client/petstore/typescript-angular2/npm/README.md

@@ -41,4 +41,4 @@ import { BASE_PATH } from './path-to-swagger-gen-service/index';
 bootstrap(AppComponent, [
     { provide: BASE_PATH, useValue: 'https://your-web-service.com' },
 ]);
-```  
+```  

samples/client/petstore/typescript-angular2/npm/api/PetApi.ts

@@ -242,7 +242,9 @@ export class PetApi {
         if (petId === null || petId === undefined) {
             throw new Error('Required parameter petId was null or undefined when calling deletePet.');
         }
-        headers.set('api_key', String(apiKey));
+        if (apiKey !== undefined && apiKey !== null) {
+            headers.set('api_key', String(apiKey));
+        }
 
         // to determine the Content-Type header
         let consumes: string[] = [