Avoid empty interpolation crash

12 years ago · 0ed3a1e76d
1 changed files with 4 additions and 2 deletions
--- a/pygal/interpolate.py
+++ b/pygal/interpolate.py
@ -39,8 +39,10 @@ def interpolation(x, y, kind):
    if len(y) < len(x):
        x = x[:len(y)]

-    x, y = zip(*filter(lambda t: None not in t, zip(x, y)))
-
+    pack = zip(*filter(lambda t: None not in t, zip(x, y)))
+    if len(pack) == 0:
+        return ident
+    x, y = pack
    if len(x) < 2:
        return ident
    if isinstance(kind, int):