Fix index err on chans w/o extern links

src/invidious/views/components/channel-information.ecr

@@ -1,7 +1,7 @@
 <% if channel.banner %>
     <div class="pure-g" id="channel-banner-container">
         <div class="pure-u-1" id="banner" style='background-image: url(/ggpht<%= URI.parse(channel.banner.not_nil!.gsub("=w1060-", "=w1280-")).request_target %>)'>
-            <% if channel.links %>
+            <% if !channel.links.empty? %>
                 <div id="link-holder">
                     <div id="link-widget-primary" class="link-widget-link">
                         <a href="<%=channel.links[0][1]%>" title=<%=channel.links[0][0]%>>