From d7518ee2379b22eb80e4df6a5ce9196234e8a915 Mon Sep 17 00:00:00 2001
From: Johann Schmitz <johann@j-schmitz.net>
Date: Sat, 8 Apr 2017 05:54:23 +0200
Subject: [PATCH] Don't fail if there are None values in the list

---
 djunin/graphs.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/djunin/graphs.py b/djunin/graphs.py
index 1470b87..66b1da4 100644
--- a/djunin/graphs.py
+++ b/djunin/graphs.py
@@ -21,6 +21,13 @@ SCOPE_YEAR = 4
 SCOPE_RANGE = 5
 
 
+def max_not_none(iter, default=None):
+    if iter is None:
+        return default
+    items = [x for x in iter if x is not None]
+    return max(items) if items else default
+
+
 class GraphDataGenerator(object):
     def __init__(self, node, graph, scope_name, range_start=None, range_end=None):
         self.data_scope_name = scope_name
@@ -147,7 +154,7 @@ class D3GraphDataGenerator(GraphDataGenerator):
     @property
     def y_max(self):
         if self._y_max is None:
-            self._y_max = max([max(v.values()) for _, v in self.graph_data])
+            self._y_max = max_not_none([max_not_none(v.values()) for _, v in self.graph_data])
         return self._y_max
     
     @property