Zero bad fields

2018-05-08 15:47:48 -04:00 · 2018-05-08 15:47:48 -04:00 · 3a40c2f8fe
parent 995851360d
commit 3a40c2f8fe
1 changed files with 2 additions and 0 deletions
--- a/piker/calc.py
+++ b/piker/calc.py
@ -27,4 +27,6 @@ def percent_change(init, new):
    """Calcuate the percentage change of some ``new`` value
    from some initial value, ``init``.
    """
+    if not (init and new):
+        return 0
    return (new - init) / init * 100.