From f8f79036d04fcef064aff35a9a60aabc3a3f0bf0 Mon Sep 17 00:00:00 2001
From: Christoph Lingg <christoph@lingg.eu>
Date: Wed, 15 Feb 2017 12:47:24 +0100
Subject: [PATCH] allow empty map

---
 staticmap/staticmap.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/staticmap/staticmap.py b/staticmap/staticmap.py
index d2139d9..d7c25c7 100644
--- a/staticmap/staticmap.py
+++ b/staticmap/staticmap.py
@@ -247,7 +247,8 @@ def render(self, zoom=None, center=None):
         """
 
         if not self.lines and not self.markers and not self.polygons and not (center and zoom):
-            raise RuntimeError("cannot render empty map, add lines / markers / polygons first")
+            if zoom is None or center is None:
+                raise RuntimeError("cannot render empty map, either add lines / markers / polygons or specify center and zoom for an empty map")
 
         if zoom is None:
             self.zoom = self._calculate_zoom()