Avoid infinite loop in ChannelVideo's to_xml/to_json methods

src/invidious/channels/channels.cr

@@ -44,15 +44,11 @@ struct ChannelVideo
     end
   end
 
-  def to_json(locale, json : JSON::Builder | Nil = nil)
+  def to_json(locale, _json : Nil = nil)
-    if json
-      to_json(locale, json)
-    else
     JSON.build do |json|
       to_json(locale, json)
     end
   end
-  end
 
   def to_xml(locale, query_params, xml : XML::Builder)
     query_params["v"] = self.id
@@ -88,15 +84,11 @@ struct ChannelVideo
     end
   end
 
-  def to_xml(locale, xml : XML::Builder | Nil = nil)
+  def to_xml(locale, _xml : Nil = nil)
-    if xml
-      to_xml(locale, xml)
-    else
     XML.build do |xml|
       to_xml(locale, xml)
     end
   end
-  end
 
   def to_tuple
     {% begin %}