attempt to handle one more multisite edge case

lib/tasks/assets.rake

@@ -51,7 +51,11 @@ task 'assets:precompile:css' => 'environment' do
 
       if ActiveRecord::Base.connection.table_exists?(Theme.table_name)
         STDERR.puts "Compiling css for #{db} #{Time.zone.now}"
-        Stylesheet::Manager.precompile_css
+        begin
+          Stylesheet::Manager.precompile_css
+        rescue => PG::UndefinedColumn
+          STDERR.puts "Skipping precompilation of CSS cause schema is old, you are precompiling prior to running migrations."
+        end
       end
     end