[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？

界面上如果有一个对话框可能弹出来，也可能不弹出，我们都要认为是正常，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();

		}

	}