chore: removes redundant null propagation operator

Signed-off-by: Vincent Biret <[email protected]>

Author: baywet

src/Microsoft.OpenApi/Writers/OpenApiWriterAnyExtensions.cs

@@ -114,7 +114,7 @@ private static void WriteObject(this IOpenApiWriter writer, JsonObject? entity)
 
         private static void WritePrimitive(this IOpenApiWriter writer, JsonValue jsonValue)
         {
-            if (jsonValue.TryGetValue(out string? stringValue))
+            if (jsonValue.TryGetValue(out string? stringValue) && stringValue is not null)
                 writer.WriteValue(stringValue);
             else if (jsonValue.TryGetValue(out DateTime dateTimeValue))
                 writer.WriteValue(dateTimeValue.ToString("o", CultureInfo.InvariantCulture)); // ISO 8601 format

src/Microsoft.OpenApi/Writers/OpenApiYamlWriter.cs

@@ -170,7 +170,7 @@ public override void WritePropertyName(string name)
         /// <param name="value">The string value.</param>
         public override void WriteValue(string value)
         {
-            if (!UseLiteralStyle || value?.IndexOfAny(new[] { '\n', '\r' }) == -1)
+            if (!UseLiteralStyle || value.IndexOfAny(['\n', '\r']) == -1)
             {
                 WriteValueSeparator();
 
@@ -190,7 +190,7 @@ public override void WriteValue(string value)
                 WriteChompingIndicator(value);
 
                 // Write indentation indicator when it starts with spaces
-                if (value is not null && value.StartsWith(" ", StringComparison.OrdinalIgnoreCase))
+                if (value[0] == ' ')
                 {
                     Writer.Write(IndentationString.Length);
                 }