With the changeover to Python for the aws-elasticbeanstalk-deploy pipe, the "S3_KEY" is set to
'{os.getenv("APPLICATION_NAME")}/{os.getenv("VERSION_LABEL")}' by default. However, "VERSION_LABEL" is not a required field, and as such is set independently to a logical value if not provided in the configuration. However, when setting "S3_KEY" this is not taken into account. The current default will make it so all versions are uploaded to S3 with "APPLICATION_NAME"/"None. this means that the zip files for all versions collide with the name "None" in S3,.
Either the default for S3_KEY should be set to use the same logic as the VERSION_LABEL, VERSION_LABEL should become required, or another reasonable default should be set that gives a valid, different name for the uploaded zip file for each deploy.
