fix: 0 cve pdf report was not generating

Signed-off-by: Terri Oda <terri.oda@intel.com>

cve_bin_tool/output_engine/__init__.py

@@ -179,6 +179,7 @@ def output_pdf(
                 pdfdoc.tblStyle,
             )
             row = 1
+            star_warn = False
             for product_info, cve_data in all_cve_data.items():
                 star_warn = True if "*" in product_info.vendor else False
                 for cve in cve_data["cves"]: