Improve visible usage to avoid NRE

framework/src/Volo.Abp.BlazoriseUI/Components/AbpExtensibleDataGrid.razor

@@ -30,7 +30,7 @@
                                                       Icon="@action.Icon"
                                                       Clicked="async () => await action.Clicked(context)"
                                                       ConfirmationMessage="() => action.ConfirmationMessage.Invoke(context)"
-                                                      Visible="async () => await action.Visible?.Invoke(context)"
+                                                      Visible="async () =>await VisibleCore(action,context)"
                                                       Text="@action.Text">
                                         </EntityAction>
                                     }
@@ -41,7 +41,7 @@
                                                       Clicked="async () => await action.Clicked(context)"
                                                       Color="@(action.Color!=null ? (Blazorise.Color)action.Color : Blazorise.Color.None)"
                                                       Icon="@action.Icon"
-                                                      Visible="async () => await action.Visible?.Invoke(context)"
+                                                      Visible="async () =>await VisibleCore(action,context)"
                                                       Text="@action.Text">
                                         </EntityAction>
                                     }

framework/src/Volo.Abp.BlazoriseUI/Components/AbpExtensibleDataGrid.razor.cs

@@ -8,6 +8,8 @@ using Volo.Abp.AspNetCore.Components.Extensibility.TableColumns;
 using System.Linq;
 using System.Text.RegularExpressions;
 using Microsoft.Extensions.Localization;
+using System.Threading.Tasks;
+using Volo.Abp.AspNetCore.Components.Extensibility.EntityActions;
 
 namespace Volo.Abp.BlazoriseUI.Components
 {
@@ -46,5 +48,17 @@ namespace Volo.Abp.BlazoriseUI.Components
                 builder.CloseComponent();
             };
         }
+
+        protected Task<bool> VisibleCore(EntityAction action, TItem item)
+        {
+            if (action.Visible != null)
+            {
+                return action.Visible.Invoke(item);
+            }
+            else
+            {
+                return Task.FromResult(true);
+            }
+        }
     }
 }