phase3: nullfix arg-bang handler (argument_type/invalid_assignment). 872 -> 621

lib/widgets/desktop/desktop_blog.dart

@@ -217,7 +217,7 @@ class DesktopBlogState extends State<DesktopBlog> {
                 children: <Widget>[
                   Container(
                     child: Text(
-                      blog.title,
+                      blog.title!,
                       style: TextStyle(
                         fontSize: 19.0,
                       ),
@@ -226,7 +226,7 @@ class DesktopBlogState extends State<DesktopBlog> {
                   ),
                   Container(
                     child: Text(
-                      Utils.utcDatetimeStringToLocalDatetimeString(context, blog.createdAt,),
+                      Utils.utcDatetimeStringToLocalDatetimeString(context, blog.createdAt!,),
                       style: TextStyle(
                         fontSize: 13.0,
                         color: Colors.grey,
@@ -266,7 +266,7 @@ class DesktopBlogState extends State<DesktopBlog> {
     _loadingFinish = false;
     HttpUtil.httpGet(
         'v1/blogs',
-        businessId: widget.businessId,
+        businessId: widget.businessId!,
         queryParameters: {
           'page': _page.toString(),
           'size': Constants.BLOG_PER_PAGE_DESKTOP.toString()