From 4ddbbc0642acacf081419b6fa8479295503c5abc Mon Sep 17 00:00:00 2001
From: Dan Howe <d.howe@wrl.unsw.edu.au>
Date: Thu, 29 Aug 2019 08:08:32 +1000
Subject: [PATCH] Return empty div if not file loaded

---
 daqviewer/daqviewer.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/daqviewer/daqviewer.py b/daqviewer/daqviewer.py
index d822a73..8385886 100644
--- a/daqviewer/daqviewer.py
+++ b/daqviewer/daqviewer.py
@@ -164,6 +164,8 @@ def update_output(contents, names, dates):
         ]
 
         return children
+    else:
+        return [html.Div([])]
 
 
 def main():