Add else case to stages/scanning/oscap-cve-run.sh

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Current Behavior

There is not a case for when there is no matching security guide for a base image type.

Purpose

Enhanced logging if this script were to not find a match.

Plan

Add and else case on line 26 to account for no matching base_image_type. Also could review updating chained if statements to be en elif block.

Acceptance Criteria

An else case is present in the script