From d85c0dab74d3af916dca623750a0d91ccf6f67ea Mon Sep 17 00:00:00 2001
From: Rachel Fenichel <fenichel@google.com>
Date: Tue, 27 Mar 2018 16:22:50 -0700
Subject: [PATCH] Fix #1484

---
 core/grid.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/grid.js b/core/grid.js
index c8b2e254e..781bf2299 100644
--- a/core/grid.js
+++ b/core/grid.js
@@ -219,6 +219,9 @@ Blockly.Grid.createDom = function(rnd, gridOptions, defs) {
           {'stroke': gridOptions['colour']}, gridPattern);
     }
     // x1, y1, x1, x2 properties will be set later in update.
+  } else {
+    // Edge 16 doesn't handle empty patterns
+    Blockly.utils.createSvgElement('line', {}, gridPattern);
   }
   return gridPattern;
 };