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Also Du meinst so:

                  <li class="nav-item">
                    <a                       
                      class="nav-link active{/if}"
                      data-toggle="tab"
                      href="#product-details"
                      role="tab"
                      aria-controls="product-details"
                      {if !$product.description} aria-selected="true"{/if}>{l s='Product Details' d='Shop.Theme.Catalog'}</a>
                  </li>
                  {/if}
                    <li class="nav-item">
                       <a
                         class="nav-link {if !$product.description} active{/if}"
                         data-toggle="tab"
                         href="#description"
                         role="tab"
                         aria-controls="description"
                         {if $product.description} aria-selected="true"{/if}>{l s='Description' d='Shop.Theme.Catalog'}</a>
                    </li>    

Dann bekomme ich aber eine Fehlermeldung:

(1/1) SmartyCompilerException
Syntax error in template "file:/mnt/web506/a3/89/510713489/htdocs/presta/themes/classic/templates/catalog/product.tpl" on line 165 "class="nav-link {if !$product.description} active{/if}"" unclosed '{block}' tag

in smarty_internal_templatecompilerbase.php line 165
at Smarty_Internal_TemplateCompilerBase->trigger_template_error('unclosed \'{block}\' tag')
in smarty_internal_compilebase.php line 196
at Smarty_Internal_CompileBase->closeTag(object(Smarty_Internal_SmartyTemplateCompiler), array('if', 'else', 'elseif'))
in smarty_internal_compile_if.php line 200
at Smarty_Internal_Compile_Ifclose->compile(array(), object(Smarty_Internal_SmartyTemplateCompiler), array(), null, null)
in smarty_internal_templatecompilerbase.php line 764
at Smarty_Internal_TemplateCompilerBase->callTagCompiler('ifclose', array(), array())
in smarty_internal_templatecompilerbase.php line 1493
at Smarty_Internal_TemplateCompilerBase->compileTag2('ifclose', array(), array())
in smarty_internal_templatecompilerbase.php line 565
at Smarty_Internal_TemplateCompilerBase->compileTag('ifclose', array())
in smarty_internal_templateparser.php line 2468
at Smarty_Internal_Templateparser->yy_r45()
in smarty_internal_templateparser.php line 3383
at Smarty_Internal_Templateparser->yy_reduce(45)
in smarty_internal_templateparser.php line 3479
at Smarty_Internal_Templateparser->doParse(5, ' <li class="nav-item"> <a class="nav-link ')
in smarty_internal_smartytemplatecompiler.php line 128

???