check for keys in dictionary before accesing them

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

AUTHORS.rst

@@ -13,3 +13,4 @@ The following organizations or individuals have contributed to this repo:
 - Navonil Das @NavonilDas
 - Tushar Upadhyay @tushar912
 - Hritik Vijay @hritik14
+- Tushar Goel @TG1999

vulnerabilities/importers/alpine_linux.py

@@ -80,9 +80,9 @@ def process_link(link) -> List[AdvisoryData]:
         return advisories
 
     for package in record["packages"]:
-        assert isinstance(record["archs"], Iterable[str])
-        assert isinstance(record["reponame"], str)
-        assert isinstance(record["distroversion"], str)
+        assert isinstance(record.get("archs"), Iterable[str])
+        assert isinstance(record.get("reponame"), str)
+        assert isinstance(record.get("distroversion"), str)
         advisories.extend(
             load_advisories(
                 package["pkg"],