Avoid settings vars for missing files, unset in that case
Avoid settings vars for missing files, unset in that case

If files are missing, don't export vars with bogus values. You may not,
for instance, need to use EC2 for all of your AWS accounts, and
additionally EC2_CERT and EC2_PRIVATE_KEY and their associated options
for the EC2 CLI tools are deprecated.

If these variables indeed will not be exported, unset them so you can
switch between accounts without tainting the environment with mixed
account settings.

michaelcontento/awsenv