From c57f5e5f0a0652a2c577d3e16a1f8207d2d45720 Mon Sep 17 00:00:00 2001
From: Johannes Weskamm <weskamm@terrestris.de>
Date: Thu, 3 Sep 2015 08:30:27 +0200
Subject: [PATCH] Add assertion for required option 'code' on
 ol.proj.Projection

Additionally clarify docs.
---
 src/ol/proj/proj.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ol/proj/proj.js b/src/ol/proj/proj.js
index 0e78c0b000..081578af4d 100644
--- a/src/ol/proj/proj.js
+++ b/src/ol/proj/proj.js
@@ -143,6 +143,8 @@ ol.proj.Projection = function(options) {
 
   var projections = ol.proj.projections_;
   var code = options.code;
+  goog.asserts.assert(goog.isDef(code),
+      'Option "code" is required for constructing instance');
   if (ol.ENABLE_PROJ4JS && typeof proj4 == 'function' &&
       !goog.isDef(projections[code])) {
     var def = proj4.defs(code);