is_action_possible() ACTION_HEAL_UNIT handling assuming seen target
As warned by clang analyzer (seen on S3_0) is_action_possible() ACTION_HEAL_UNIT assumes non-NULL target_unit and target_unittype.
As warned by clang analyzer (seen on S3_0) is_action_possible() ACTION_HEAL_UNIT assumes non-NULL target_unit and target_unittype.