Always write required json properties

Author: ptr727

PlexCleaner.schema.json

@@ -239,7 +239,8 @@
           },
           "required": [
             "Video",
-            "Audio"
+            "Audio",
+            "Global"
           ]
         },
         "HandBrakeOptions": {

PlexCleaner/ConvertOptions.cs

@@ -24,6 +24,7 @@ public record FfMpegOptions
     public string Audio { get; set; } = string.Empty;
 
     // v3 : Value no longer needs defaults
+    [JsonRequired]
     public string Global { get; set; } = string.Empty;
 
     // v3 : Removed

PlexCleaner/JsonSerialization.cs

@@ -51,6 +51,11 @@ private sealed class IgnoreEmptyStringTypeInfoResolver(IJsonTypeInfoResolver inn
                     continue;
                 }
 
+                if (property.IsRequired)
+                {
+                    continue;
+                }
+
                 Func<object, object?, bool>? existing = property.ShouldSerialize;
                 property.ShouldSerialize = (obj, value) =>
                     !string.IsNullOrEmpty(value as string)