From dcfff4d5de033af0d4d126b0affefc3a6f87ed76 Mon Sep 17 00:00:00 2001
From: Helena Rasche <hxr@hx42.org>
Date: Fri, 26 Apr 2019 13:20:26 +0200
Subject: [PATCH] ensure a string is returned

Very old values in EU db were missing this.
---
 scripts/grt/export.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/grt/export.py b/scripts/grt/export.py
index 24e5f447ce0..a3eab5d71ce 100644
--- a/scripts/grt/export.py
+++ b/scripts/grt/export.py
@@ -49,7 +49,10 @@ def kw_metrics(job):
 
 
 def round_to_2sd(number):
-    return str(int(float('%.2g' % number)))
+    if number:
+        return str(int(float('%.2g' % number)))
+    else:
+        return '-1'
 
 
 def main(argv):