Remove conditional assignment
Remove conditional assignment

HTML nodes are guaranteed to be detached before being re-attached, so we
are always sure that `subscriptions` is null on attach and non-null on
detach.
Ingramz/atom,Ingramz/atom,sotayamashita/atom,me-benni/atom,Mokolea/atom,wiggzz/atom,AlexxNica/atom,t9md/atom,gontadu/atom,stinsonga/atom,helber/atom,Mokolea/atom,PKRoma/atom,atom/atom,rlugojr/atom,bj7/atom,florianb/atom,brettle/atom,PKRoma/atom,andrewleverette/atom,tjkr/atom,FIT-CSE2410-A-Bombs/atom,brettle/atom,decaffeinate-examples/atom,brumm/atom,liuderchi/atom,kevinrenaers/atom,stinsonga/atom,wiggzz/atom,brumm/atom,Arcanemagus/atom,stinsonga/atom,CraZySacX/atom,t9md/atom,daxlab/atom,me-benni/atom,Austen-G/BlockBuilder,Austen-G/BlockBuilder,Ingramz/atom,AlexxNica/atom,helber/atom,kevinrenaers/atom,bsmr-x-script/atom,rlugojr/atom,hellendag/atom,AlexxNica/atom,AdrianVovk/substance-ide,andrewleverette/atom,hellendag/atom,daxlab/atom,florianb/atom,decaffeinate-examples/atom,bj7/atom,florianb/atom,ashneo76/atom,daxlab/atom,bolinfest/atom,wiggzz/atom,FIT-CSE2410-A-Bombs/atom,brumm/atom,kevinrenaers/atom,bolinfest/atom,atom/atom,stinsonga/atom,Austen-G/BlockBuilder,tjkr/atom,sotayamashita/atom,florianb/atom,florianb/atom,PKRoma/atom,AdrianVovk/substance-ide,andrewleverette/atom,Mokolea/atom,t9md/atom,FIT-CSE2410-A-Bombs/atom,bsmr-x-script/atom,Arcanemagus/atom,decaffeinate-examples/atom,helber/atom,ardeshirj/atom,AdrianVovk/substance-ide,bj7/atom,liuderchi/atom,brettle/atom,ashneo76/atom,sotayamashita/atom,liuderchi/atom,xream/atom,ardeshirj/atom,decaffeinate-examples/atom,liuderchi/atom,xream/atom,bsmr-x-script/atom,Austen-G/BlockBuilder,ashneo76/atom,tjkr/atom,CraZySacX/atom,gontadu/atom,ardeshirj/atom,Arcanemagus/atom,hellendag/atom,CraZySacX/atom,rlugojr/atom,atom/atom,bolinfest/atom,gontadu/atom,xream/atom,Austen-G/BlockBuilder,Austen-G/BlockBuilder,me-benni/atom