Ignore credential_process when set to the empty string #3099
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This implements the fix to
botocore.credentials.ProcessProvider.load()
described in #3098. I added a test that reproduced the bug. The test passes with my fix applied.Please note that linting fails in test code released as part of botocore 1.34.18. I didn't think it wise to modify anything outside the scope of my bug report but am happy to commit a style fix if necessary.