Add wait for empty connection pool

src/invidious.cr

@@ -71,6 +71,10 @@ end
 
 def fetch_video(id)
   # Grab connection from pool
+  while POOL.empty?
+    sleep rand(0..10).milliseconds
+  end
+
   client = POOL.pop
 
   # client = HTTP::Client.new("www.youtube.com", 443, CONTEXT)
@@ -196,6 +200,10 @@ end
 get "/search" do |env|
   query = env.params.query["q"]
 
+  while POOL.empty?
+    sleep rand(0..10).milliseconds
+  end
+
   client = POOL.pop
 
   html = client.get("https://www.youtube.com/results?q=#{URI.escape(query)}&page=1").body