Testing wrong key when reading `metric_octopus_export`

[Tim-Mawson-i2]

Line 512 should be testing for the existence of metric_octopus_export, not metric_octopus_import:

if 'metric_octopus_export' in self.args:

instead of

if 'metric_octopus_import' in self.args:

[springfall2008]

Thanks Tim, as chance had it I also fixed this issue yesterday:)