ImportHandler: early return via DeMorgan's law
ImportHandler: early return via DeMorgan's law

Inverted a boolean condition, no functional changes.

storytouch/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,ether/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,cloudfoundry-community/etherpad-lite-cf,aptivate/etherpad-lite,storytouch/etherpad-lite,joequant/etherpad-lite,aptivate/etherpad-lite,aptivate/etherpad-lite,joequant/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,cloudfoundry-community/etherpad-lite-cf,cloudfoundry-community/etherpad-lite-cf,storytouch/etherpad-lite