Merge pull request DefectDojo#1018 from dr3dd589/npm-audit-scan-parser-unittest

add unittest for npm audit scan parser

Author: aaronweaver

dojo/tools/npmaudit/parser.py

@@ -14,6 +14,9 @@ def __init__(self, json_output, test):
             self.items = []
 
     def parse_json(self, json_output):
+        if json_output is None:
+            self.items = []
+            return
         try:
             tree = json.load(json_output)
             subtree = tree.get('advisories')