Fix tests

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

vulnerabilities/import_runner.py

@@ -88,8 +88,6 @@ def process_advisories(
         count = 0
         advisories = []
         for data in advisory_datas:
-            # https://nvd.nist.gov/vuln/detail/CVE-2013-4314
-            # https://github.com/cms-dev/cms/issues/888#issuecomment-516977572
             try:
                 obj, created = Advisory.objects.get_or_create(
                     aliases=data.aliases,

vulnerabilities/importer.py

@@ -249,14 +249,16 @@ class AdvisoryData:
     date_published: Optional[datetime.datetime] = None
     weaknesses: List[int] = dataclasses.field(default_factory=list)
 
-
     def __post_init__(self):
         if self.date_published and not self.date_published.tzinfo:
             logger.warning(f"AdvisoryData with no tzinfo: {self!r}")
         self.clean_summary()
 
     def clean_summary(self):
-        self.summary = self.summary.replace("\x00", "\uFFFD")
+        # https://nvd.nist.gov/vuln/detail/CVE-2013-4314
+        # https://github.com/cms-dev/cms/issues/888#issuecomment-516977572
+        if self.summary:
+            self.summary = self.summary.replace("\x00", "\uFFFD")
 
     def to_dict(self):
         return {