avoid NullPointerException for invalid AZ #197
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I failed to run the original code in processor mode, because it tried to load EC2 RI pricing for ap-southeast-2c. Odd enough, it's not defined in com.netflix.ice.tag.Zone
But obviously, there is a coding issue than you should quit the current loop if the zone doesn't exist, not just logger.error and let NPE occurs in next statement.
Please review.