Workaround:
import com.kms.katalon.core.exception.StepErrorException as StepErrorException
import com.kms.katalon.core.exception.StepFailedException as StepFailedException
present1 = WebUI.waitForElementPresent(findTestObject('Object Repository/TestPage/msgBox'), 1)
if ( present1 ) throw new StepFailedException ( "Cant find msgBox" )
or if you like
if ( WebUI.waitForElementPresent(findTestObject('Object Repository/TestPage/msgBox'), 1) ) {
throw new StepFailedException ( "Cant find msgBox" )
}