ec2deprecateimg should only check regions where the deprecating image exists

[KeithMnemonic]

When running this command:

ec2deprecateimg --image-name suse-sles-11-sp4-byos-v20180816-pv-ssd-x86_64 --replacement-name suse-sles-12-sp3-byos-v20190314-hvm-ssd-x86_64 --account resale-images --verbose

this error shown is

Region: af-south-1 -> Replacement image not found, "suse-sles-12-sp3-byos-v20190314-hvm-ssd-x86_64" did not match any image.
Region: eu-south-1 -> Replacement image not found, "suse-sles-12-sp3-byos-v20190314-hvm-ssd-x86_64" did not match any image.
Region: me-south-1 -> Replacement image not found, "suse-sles-12-sp3-byos-v20190314-hvm-ssd-x86_64" did not match any image.

but the source image suse-sles-11-sp4-byos-v20180816-pv-ssd-x86_64 does not exist in these regions and should not produce this message