Fix ReSharper's "UseNullPropagation"

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo/Views/Components/Themes/Shared/TagHelpers/AbpComponentDemoSectionTagHelper.cs

@@ -120,10 +120,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.Demo.Views.Components.Themes.S
 
                     return sourceBuilder.ToString();
                 }
-                else if (sourceBuilder != null)
-                {
-                    sourceBuilder.AppendLine(line);
-                }
+                else sourceBuilder?.AppendLine(line);
             }
 
             throw new AbpException($"Could not find {Title} demo section inside {ViewPath}");

framework/src/Volo.Abp.BackgroundWorkers.Quartz/Volo/Abp/BackgroundWorkers/Quartz/QuartzBackgroundWorkerAdapter.cs

@@ -75,10 +75,7 @@ namespace Volo.Abp.BackgroundWorkers.Quartz
                 }
                 case PeriodicBackgroundWorkerBase syncWorker:
                 {
-                    if (_doWorkMethod != null)
-                    {
-                        _doWorkMethod.Invoke(syncWorker, new object[] {workerContext});
-                    }
+                    _doWorkMethod?.Invoke(syncWorker, new object[]{workerContext});
 
                     break;
                 }