[Selenium]对于某些对话框即有可能弹出来，也有可能不弹出来，这种应该怎么处理呢？

/**
* check if release notes dialog present
* @author j
*/
public boolean isReleaseNotesDialogPresent(){
try{
new WebDriverWait(driver, 30).until(ExpectedConditions.presenceOfElementLocated(By.cssSelector("div#releaseNotes")));
return true;
}
catch(Exception e){
logger.info("There's no release notes dialog pop up");
return false;
}
}

/**
* check if release notes dialog present,if yes,close release notes dialog by click close button
* @author j
*/
public void closeReleaseNotesDialog(){
boolean isDialogPresent=isReleaseNotesDialogPresent();
if(isDialogPresent==true){
SeleniumUtil.waitForElementPresent(driver, By.cssSelector("input#btnClose")).click();
}
}