Options with empty string values ignored

Created by: davidbpirie

I notice that an option with REQUIRED_ARGUMENT can be provided an empty string as a value, but when iterating over the options array this option is skipped. I believe this is because GetOpt ->getIterator() is only returning options where the value evaluates to a true boolean in PHP, and an empty string gets evaluated as false.

Is this intended behaviour? Should the test instead be changed to !is_null()?