Changed online search failure to warning and removed stacktrace

Library/Homebrew/cask/lib/hbc/cli/search.rb

@@ -26,9 +26,8 @@ module Hbc
             filename: query,
             extension: "rb",
           )
-        rescue GitHub::Error => e
+        rescue GitHub::Error => error
-          onoe e
+          opoo "Online search failed: #{error}\n"
-          $stderr.puts e.backtrace
           []
         end
         matches.map do |match|