fix to https://github.com/ether/etherpad-lite/issues/2486
fix to https://github.com/ether/etherpad-lite/issues/2486

ether/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,cloudfoundry-community/etherpad-lite-cf,ether/etherpad-lite,University-of-Potsdam-MM/etherpad-lite,joequant/etherpad-lite,joequant/etherpad-lite,storytouch/etherpad-lite,lpagliari/etherpad-lite,aptivate/etherpad-lite,aptivate/etherpad-lite,aptivate/etherpad-lite,lpagliari/etherpad-lite,storytouch/etherpad-lite,University-of-Potsdam-MM/etherpad-lite,joequant/etherpad-lite,lpagliari/etherpad-lite,University-of-Potsdam-MM/etherpad-lite,ether/etherpad-lite,lpagliari/etherpad-lite,aptivate/etherpad-lite,joequant/etherpad-lite,University-of-Potsdam-MM/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,cloudfoundry-community/etherpad-lite-cf,storytouch/etherpad-lite