Tag helpers minor refactor

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/AbpSelectTagHelperService.cs

@@ -141,8 +141,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Form
 
                 if (baseType == null) { return null; }
 
-                var value = Convert.ChangeType(modelExplorer.Model, baseType);
-                return value != null ? value.ToString() : "";
+                return Convert.ChangeType(modelExplorer.Model, baseType)?.ToString() ?? "";
             }
             else
             {

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Form/FormGroupItem.cs

@@ -5,10 +5,5 @@
         public string HtmlContent { get; set; }
 
         public int Order { get; set; }
-
-        public FormGroupItem()
-        {
-            
-        }
     }
 }

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Grid/AbpContainerTagHelperService.cs

@@ -10,6 +10,5 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Grid
             output.TagName = "div";
             output.Attributes.AddClass("container");
         }
-        
     }
 }

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Grid/AbpRowTagHelperService.cs

@@ -33,6 +33,5 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Grid
 
             output.Attributes.AddClass("justify-content-" + TagHelper.HAlign.ToString().ToLowerInvariant());
         }
-
     }
 }