Change set_utf8_values! to cope with 'INSERT INTO table DEFAULT VALUES' style inserts.

Author: h-lame

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -940,7 +940,7 @@ def set_utf8_values!(sql)
             utf8_cols.each do |col|
               sql.gsub!("[#{col.to_s}] = '", "[#{col.to_s}] = N'")
             end
-          elsif sql =~ /^\s*INSERT/i
+          elsif sql =~ /^\s*INSERT/i and sql !~ /DEFAULT VALUES\s*$/i
             # TODO This code should be simplified
             # Get columns and values, split them into arrays, and store the original_values for when we need to replace them
             columns_and_values = sql.scan(/\((.*?)\)/m).flatten