Report errors connecting to malpd socket

cgi-bin/malp.rb

@@ -85,10 +85,17 @@ if cgi.params.key?("content")
   if authenticated
     html = ""
 
+    begin
       sock = UNIXSocket.new("/run/malpd/malpd.sock")
       sock.puts "info"
       info = JSON.parse(sock.gets)
       sock.close
+    rescue
+      cgi.out("type" => "text/html", "charset" => "UTF-8") do
+        "Could not connect to malpd socket"
+      end
+      exit
+    end
 
     info.each do |entry|
       case entry["type"]