only invoke DayClick if not null (#14)

Author: valincius

BlazorScheduler/BlazorScheduler.csproj

@@ -8,7 +8,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageProjectUrl></PackageProjectUrl>
     <RepositoryUrl>https://github.com/valincius/BlazorScheduler</RepositoryUrl>
-    <Version>2.1.1</Version>
+    <Version>2.1.2</Version>
   </PropertyGroup>
 
   <ItemGroup>

BlazorScheduler/Internal/Components/SchedulerDay.razor.cs

@@ -37,7 +37,7 @@ private void OnMouseDown(MouseEventArgs e)
 
         private void OnDayClick()
         {
-            Scheduler?.OnDayClick(Day);
+            Scheduler.OnDayClick?.Invoke(Day);
         }
     }
 }