getIsValidEntry(step) {
    if (step != null) {
      if (!_.contains(this._stepsProcessed, step)) {
        const action = step.getAction();
        return action instanceof SDK.PlayCardFromHandAction || action instanceof SDK.PlaySignatureCardAction;
      }
    }
    return false;
  }
Returns whether a step is a valid entry to the battle log.
@param step
@returns {Boolean}