Allow None values for plot clicks or SI values

[hooke.git] / hooke / util / si.py

diff --git a/hooke/util/si.py b/hooke/util/si.py
index 48fe4e0c87d7fbb1f725a382325f8223edbb30b7..ac3e633746571177bb1e8c2f83d214fc8704d8de 100644 (file)
--- a/hooke/util/si.py
+++ b/hooke/util/si.py
@@ -111,7 +111,7 @@ def ppSI(value, unit='', decimals=None, power=None, pad=False):
     """
     if value == 0:
         return '0'
-    if isnan(value):
+    if value == None or isnan(value):
         return 'NaN'
 
     if power == None:  # auto-detect power