Apparently it is possible for MOUSes to have 'null' files

Author: keflavich

astroquery/alma/core.py

@@ -895,7 +895,7 @@ def _json_summary_to_table(self, data, base_url):
         """
         columns = {'uid': [], 'URL': [], 'size': []}
         for entry in data['node_data']:
-            is_file = (entry['de_type'] == 'MOUS' or
+            is_file = (entry['de_type'] == 'MOUS' and
                        (entry['file_name'] != 'null' and
                         entry['file_key'] != 'null'))
             if is_file:
@@ -922,6 +922,9 @@ def _json_summary_to_table(self, data, base_url):
                                    entry['file_key'],
                                    entry['file_name'],
                                    )
+                if 'null' in url:
+                    raise ValueError("The URL {0} was created containing "
+                                     "'null', which is invalid.".format(url))
                 columns['URL'].append(url)
 
         columns['size'] = u.Quantity(columns['size'], u.Gbyte)