support/scripts/pkg-stats: ignore packages with no valid infra and no version for CVE checking

Virtual packages (with in pkg-stats speak have "no valid
infrastructure") and packages that have no version specified cannot be
used for CVE checking. They trigger a bunch of warnings from the CVE
checking code, as it cannot parse their version: they don't have any
version. So instead, we simply skip those packages.

A follow-up commit will improve the reporting to be able to
distinguish those packages from packages that have seen their CVEs
checked and don't have any reported.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/scripts/pkg-stats

@@ -570,6 +570,10 @@ def check_package_cves(nvd_path, packages):
 
     cpe_product_pkgs = defaultdict(list)
     for pkg in packages:
+        if not pkg.has_valid_infra:
+            continue
+        if not pkg.current_version:
+            continue
         if pkg.cpeid:
             cpe_product = cvecheck.cpe_product(pkg.cpeid)
             cpe_product_pkgs[cpe_product].append(pkg)