fix editing certain playouts when using mysql (#2656)

CHANGELOG.md

@@ -87,6 +87,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Work around sequential schedule validation limit (1000/hr by Newtonsoft.Json.Schema library)
   - Playout builds now use JsonSchema.Net library which has no validation limit
   - Validation tool in the UI still uses Newtonsoft.Json.Schema (with 1000/hr limit) as the error output is easier to understand
+- Fix editing scripted and sequential playouts when using MySql
 
 ### Changed
 - Classic schedules: `Refresh` classic playouts from playout list; do not `Reset` them

ErsatzTV/Pages/ScriptedPlayoutEditor.razor

@@ -23,7 +23,10 @@
                 <div class="d-flex">
                     <MudText>Scripted Schedule</MudText>
                 </div>
-                <MudTextField @bind-Value="@_playout.ScheduleFile" For="@(() => _playout.ScheduleFile)"/>
+                @if (_playout is not null)
+                {
+                    <MudTextField @bind-Value="@_playout.ScheduleFile" For="@(() => _playout.ScheduleFile)"/>
+                }
             </MudStack>
             <MudText Typo="Typo.h5" Class="mt-10 mb-2">Maintenance</MudText>
             <MudDivider Class="mb-6"/>

ErsatzTV/Pages/SequentialPlayoutEditor.razor

@@ -23,7 +23,10 @@
                 <div class="d-flex">
                     <MudText>Sequential Schedule</MudText>
                 </div>
-                <MudTextField @bind-Value="@_playout.ScheduleFile" For="@(() => _playout.ScheduleFile)"/>
+                @if (_playout is not null)
+                {
+                    <MudTextField @bind-Value="@_playout.ScheduleFile" For="@(() => _playout.ScheduleFile)"/>
+                }
             </MudStack>
             <MudText Typo="Typo.h5" Class="mt-10 mb-2">Maintenance</MudText>
             <MudDivider Class="mb-6"/>