protected static Authorizations getAuthorizationsFromValue(String authorizationStr) {
    if (null == authorizationStr) {
      return null;
    }

    return new Authorizations(authorizationStr);
  }
Create an Authorizations object when the provided value is not null. Will return null,
otherwise.

@param authorizationStr
         Configuration value to parse
@return Authorization object or null
accumulo-handler/src/java/org/apache/hadoop/hive/accumulo/serde/AccumuloSerDeParameters.java