Filter out vulnerabilities reported by the MSRC API for non-Microsoft vulnerabilities

[wdormann]

When the MSRC API is used to get vulnerabilities for a given month, it will return vulnerabilities for which there is an MSRC publication, as well as some stray vulnerabilities for which there are no MSRC publications. I noticed this when tweaking the script to save a copy of the MSRC publications in Archivebox:

To fix this, patch-review.py should only consider vulnerabilities returned by the MSRC API that have titles. There might be a cleaner way to do this, but what I did was filter the all_vulns list with an additional line:

    all_vulns = release_json.get('Vulnerability', [])
    all_vulns = [vuln for vuln in all_vulns if vuln.get('Title', {'Value': 'Not Found'}).get('Value') is not None]
    len_vuln = len(all_vulns)

For the July 2024 MSRC publication, this corrects the count from 247 to 152.