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/SmartText/SmartEmbedTextArray.cs

@@ -0,0 +1,28 @@
+#nullable disable
+namespace NadekoBot;
+
+public sealed record SmartEmbedTextArray : SmartText
+{
+    public string PlainText { get; set; }
+    public SmartEmbedText[] Embeds { get; set; }
+
+    public bool IsValid
+        => Embeds?.All(x => x.IsValid) ?? false;
+
+    public EmbedBuilder[] GetEmbedBuilders()
+    {
+        if (Embeds is null)
+            return Array.Empty<EmbedBuilder>();
+
+        return Embeds.Map(em => em.GetEmbed());
+    }
+
+    public void NormalizeFields()
+    {
+        if (Embeds is null)
+            return;
+        
+        foreach(var eb in Embeds)
+            eb.NormalizeFields();
+    }
+}