Removes trailing '1' in API html output
Removes trailing '1' in API html output

the buildOutput method in HtmlView.php was returning true, which when the output was being echoed this was converted to '1'.

This fixes #JOINDIN-729 by  updating the return value to be null.

dstockto/joindin-api,joindin/joindin-api,heiglandreas/joindin-api,heiglandreas/joindin-api,railto/joindin-api,joindin/joindin-api,dstockto/joindin-api,railto/joindin-api,heiglandreas/joindin-api,lornajane/joindin-api,lornajane/joindin-api,dstockto/joindin-api,joindin/joindin-api,railto/joindin-api,lornajane/joindin-api