DES MOINES — Gov. Kim Reynolds said Tuesday she has been given assurance from her emergency management team that Iowa’s emergency alert system has built-in safeguards designed to avoid a false alarm like the one in Hawaii last weekend that had residents bracing for a possible nuclear attack.Reynolds said she had her staff contact the state’s Department of Homeland Security and Emergency Management to make sure Iowa could not have a similar situation to one that occurred Saturday when a Hawaii emergency management employee set off a statewide panic by sending out a false alarm about an incoming ballistic missile.