Update edit.html

app/admin/view/article/edit.html

@@ -5,7 +5,7 @@
             <div class="layui-input-block">
                 <select class="layui-select" name="category_id">
                     {volist name='category' id='vo'}
-                    <option value="{$key}" {if $info.category_id==$key}selected{/if}>{$vo}</option>
+                    <option value="{$key}" {if !empty($info.category_id) && $info.category_id==$key}selected{/if}>{$vo}</option>
                     {/volist}
                 </select>
             </div>
@@ -118,4 +118,4 @@
         });
 
     });
-</script>
\ No newline at end of file
+</script>