处理BigDecimal空指针异常

BigDecimal在java中是一种特殊的类了，关于BigDecimal中空指针异常的处理做了如下的控制就可以了

if (!monthlyPaymentsSum.equals(BigDecimal.ZERO))
		{
			debtEchoInfo.setCreditMonthlyWithoutCard(monthlyPaymentsSum.add(debtEchoInfo.getCardMonthly()));
		}else {
			debtEchoInfo.setCreditMonthlyWithoutCard(debtEchoInfo.getCardMonthly());
		}