From 31f05663791f78adf6737c53e342faf2e68b8942 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Thu, 28 Feb 2019 19:48:31 +0800
Subject: foreground: Do not add to products if empty

---
 fg21sim/foregrounds.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fg21sim/foregrounds.py b/fg21sim/foregrounds.py
index 45faa52..4451725 100644
--- a/fg21sim/foregrounds.py
+++ b/fg21sim/foregrounds.py
@@ -104,7 +104,7 @@ class Foregrounds:
         comp_obj = comp_cls(self.configs)
         comp_obj.preprocess()
         skyfiles = comp_obj.simulate()
-        if self.products:
+        if self.products and skyfiles:
             self.products.add_component(compID, skyfiles)
         comp_obj.postprocess()
 
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