Properly combine scan data #1439

Signed-off-by: Jono Yang <jyang@nexb.com>

Author: JonoYang

src/scancode/resource.py

@@ -1406,10 +1406,12 @@ def _get_scan_data(self, location):
         if isinstance(location, dict):
             return location
         if isinstance(location, (list, tuple,)):
-            scan_data = OrderedDict()
+            combined_scan_data = OrderedDict(headers=[], files=[])
             for loc in location:
-                scan_data.update(self._get_scan_data_helper(loc))
-            return scan_data
+                scan_data = self._get_scan_data_helper(loc)
+                combined_scan_data['headers'].extend(scan_data['headers'])
+                combined_scan_data['files'].extend(scan_data['files'])
+            return combined_scan_data
         return self._get_scan_data_helper(location)
 
     def _create_empty_resource_data(self):