--- gzip.py 2018-03-09 16:39:34.000000000 -0800
+++ gzip.py 2018-03-09 16:40:08.000000000 -0800
@@ -96,7 +96,7 @@
             # Issue #13781: os.fdopen() creates a fileobj with a bogus name
             # attribute. Avoid saving this in the gzip header's filename field.
             if hasattr(fileobj, 'name') and fileobj.name != '<fdopen>':
-                filename = fileobj.name
+                filename = fileobj.name or ''
             else:
                 filename = ''
         if mode is None: