fix dl_database for records with no dat files

cx1111 · cx1111 · commit ede9729f63e7 · 2018-04-17T14:38:47.000-04:00
diff --git a/wfdb/version.py b/wfdb/version.py
@@ -1 +1 @@
-__version__ = '2.0.3'
+__version__ = '2.0.4'
