error in nested parsing

[Petr Fořt]

Hello,
  I have problem with nested element. If there is {row inside another {row (I use {row, but it is not important) is it OK until there is {}, for example device='{}'. If I render this in php version of smarty it is OK, but in jsmart it throw me:
Error: Unclosed {row +[^}]*}

code with error:
{row cols="0"}

   {column size="1/1" idComponent="Web_1396357351428"}

      {row cols="0"}

         {column device='{}' size="1/1"}

         {/column}

      {/row}

   {/column}

{/row}

OK (but no config):
{row cols="0"}

   {column size="1/1" idComponent="Web_1396357351428"}

      {row cols="0"}

         {column size="1/1"}

         {/column}

      {/row}

   {/column}

{/row}

I'am using {} configuration to store JSON. I tried ' {} ' } with whitespace, but the result is the same. Am I missing something or it is a bug/(difference between php version and js)?
Thanks
Petr