parsers/mysql.py: skip CVE if CVSS is not found

[Mauro Matteo Cascella]

CVE-2022-1292 in MySQL Oracle CPU Jul 2022 (https://www.oracle.com/security-alerts/cpujul2022verbose.html#MSQL) has no CVSS score. As a result, the parser is failing here:

https://github.com/mprpic/advisory-parser/blob/master/advisory_parser/parsers/mysql.py#L135

ValueError: not enough values to unpack (expected 2, got 1).

Proposed patch:

--- advisory_parser/parsers/mysql.py.orig	2022-08-04 14:35:50.421965529 +0200
+++ advisory_parser/parsers/mysql.py	2022-08-04 14:36:10.956021469 +0200
@@ -134,7 +134,15 @@
         description = "\n".join(description)
 
         # Take the text part only, i.e. anything before the CVSS string
-        description, cvss_text = re.split(r"\n\s*CVSS v?3\.[0-9] (?=Base Score)", description)
+        desc_cvss = re.split(r"\n\s*CVSS v?3\.[0-9] (?=Base Score)", description)
+        if len(desc_cvss) != 2:
+            warnings.append(
+                "ERROR: Could not identify CVSS score in {}; skipping:\n\n{}\n---".format(
+                    cve, description
+                )
+            )
+            continue
+        description, cvss_text = desc_cvss
 
         # Filter out some whitespace
         description = description.replace("\n", " ").replace("  ", " ").strip()