Happens when playing Brain Blast in a room with 3 birds through a "play card at start of combat" relic (which would not cause a target to be selected).

08:39:10.294 INFO basemod.BaseMod> publish on card use: Snowpunk:BrainBlast
08:39:10.694 INFO core.CardCrawlGame> Exception occurred in CardCrawlGame render method!
08:39:10.695 ERROR core.CardCrawlGame> Exception caught
java.lang.NullPointerException: null
at com.megacrit.cardcrawl.actions.common.DamageAllEnemiesAction.update(DamageAllEnemiesAction.java:98) ~[?:?]
at com.megacrit.cardcrawl.actions.GameActionManager.update(GameActionManager.java:179) ~[?:?]
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java:325) ~[?:?]