Fixed a nullref message when the bot is loading medusae. Added support for multiple embeds in features which support custom embeds in the form of

{plainText:text-here, embeds: [embedObject, embedObject, embedObject]}

src/NadekoBot/Common/Replacements/Replacer.cs

@@ -36,9 +36,17 @@ public class Replacer
         {
             SmartEmbedText embedData => Replace(embedData),
             SmartPlainText plain => Replace(plain),
+            SmartEmbedTextArray arr => Replace(arr), 
             _ => throw new ArgumentOutOfRangeException(nameof(data), "Unsupported argument type")
         };
 
+    public SmartEmbedTextArray Replace(SmartEmbedTextArray embedArr)
+        => new()
+        {
+            Embeds = embedArr.Embeds.Map(Replace),
+            PlainText = Replace(embedArr.PlainText)
+        };
+
     public SmartPlainText Replace(SmartPlainText plainText)
         => Replace(plainText.Text);