don't fail if no scans are found

vulnwhisp/frameworks/qualys_vm.py

@@ -29,6 +29,8 @@ class qualysWhisperAPI(object):
     def scan_xml_parser(self, xml):
         all_records = []
         root = ET.XML(xml.encode('utf-8'))
+        if not root.find('.//SCAN_LIST'):
+            return pd.DataFrame(columns=['id', 'status'])
         for child in root.find('.//SCAN_LIST'):
             all_records.append({
                 'name': child.find('TITLE').text,

vulnwhisp/frameworks/qualys_was.py

@@ -120,6 +120,8 @@ class qualysWhisperAPI(object):
                     _records.append(scan_info)
             self.logger.debug('Converting XML to DataFrame')
             dataframes = [self.xml_parser(xml) for xml in _records]
+            if not dataframes:
+                return pd.DataFrame(columns=['id'])
         except Exception as e:
             self.logger.error("Couldn't process all scans: {}".format(e))