pass an empty string here instead of null
pass an empty string here instead of null

react-virtualized now reports a runtime error when passing null here
so for simplicity sake (and to disable defaults) let's use an empty
string here

kactus-io/kactus,kactus-io/kactus,gengjiawen/desktop,desktop/desktop,kactus-io/kactus,say25/desktop,say25/desktop,j-f1/forked-desktop,gengjiawen/desktop,desktop/desktop,shiftkey/desktop,shiftkey/desktop,artivilla/desktop,artivilla/desktop,j-f1/forked-desktop,desktop/desktop,shiftkey/desktop,artivilla/desktop,j-f1/forked-desktop,say25/desktop,j-f1/forked-desktop,artivilla/desktop,desktop/desktop,say25/desktop,gengjiawen/desktop,shiftkey/desktop,kactus-io/kactus,gengjiawen/desktop