Custom error on channel search, handle in search

src/invidious/search.cr

@@ -1,3 +1,6 @@
+class ChannelSearchException < InfoException
+end
+
 def channel_search(query, page, channel)
   response = YT_POOL.client &.get("/channel/#{channel}")
 
@@ -6,7 +9,7 @@ def channel_search(query, page, channel)
     response = YT_POOL.client &.get("/c/#{channel}") if response.status_code == 404
     initial_data = extract_initial_data(response.body)
     ucid = initial_data.dig?("header", "c4TabbedHeaderRenderer", "channelId").try(&.as_s?)
-    raise InfoException.new("Impossible to extract channel ID from page") if !ucid
+    raise ChannelSearchException.new("Impossible to extract channel ID from page") if !ucid
   else
     ucid = channel
   end
@@ -210,7 +213,13 @@ def process_search_query(query, page, user, region)
   search_query = (query.split(" ") - operators).join(" ")
 
   if channel
-    count, items = channel_search(search_query, page, channel)
+    begin
+      count, items = channel_search(search_query, page, channel)
+    rescue ChannelSearchException
+      # most likely reason for this is that they provided an invalid channel id to the search
+      count = 0
+      items = [] of ChannelVideo
+    end
   elsif subscriptions
     if view_name
       items = PG_DB.query_all("SELECT id,title,published,updated,ucid,author,length_seconds FROM (