When I use the ContentTranslation Tool, in the section to add categories, if I type a category to add to the destination wiki, the "related categories" not shown.
== Impact ==
User can't add category in ContentTranslation with this bug (either existance or user defined)
== Console error ==
(with guwiki)
```
jQuery.Deferred exception: (query.pages || []).forEach is not a function TypeError: (query.pages || []).forEach is not a function
at CategoryInputWidget.ve.ui.MWCategoryInputWidget.getLookupCacheDataFromResponse (<anonymous>:304:119)
at CategoryInputWidget.mw.cx.ui.CategoryInputWidget.getLookupCacheDataFromResponse (<anonymous>:288:535)
at CategoryInputWidget.OO.ui.mixin.LookupElement.getRequestCacheDataFromResponse (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:342:749)
at https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:337:768
at fire (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:46:209)
at fireWith (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:47:402)
at mightThrow (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:49:751)
at process (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:49:808)
at https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:50:37
at mightThrow (https://gu.wikipedia.org/w/load.php?lang=gu&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets%7Cjquery.ui&skin=vector&version=tjfue:49:149) undefined
```
== Screenshot example ==
{F32200147}