This condition causes a bug in the suggestion boxes of the categories on the left of the form:

![search_result_bug](https://f.cloud.github.com/assets/651980/536404/3497ccf8-c155-11e2-9af1-47a25a8f5620.png)

It should be `if(data.synonym)`, which is equivalent to checking if this property is `undefined` or empty string.