From 593b33a10286ced547b75aa3394bca84bb79bd24 Mon Sep 17 00:00:00 2001
From: Steven Looman <steven.looman@gmail.com>
Date: Sun, 21 Feb 2016 11:45:05 +0100
Subject: [PATCH] Report when no coverage data is found. Fixes #12

---
 lib/lcov.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/lcov.js b/lib/lcov.js
index 1702100..bdce101 100644
--- a/lib/lcov.js
+++ b/lib/lcov.js
@@ -18,7 +18,11 @@ function LCov(runner) {
   runner.on('end', function(){
     // In a browser context, coverage will be in window.$jscoverage or window._$blanket.
     var g = typeof(global) != 'undefined' ? global : window;
-    var cov = g._$jscoverage || g._$blanket || {};
+    var cov = g._$jscoverage || g._$blanket;
+    if (!cov) {
+        console.error('mocha-lcov-reporter: No coverage data found, make sure your code is properly instrumented');
+        return;
+    }
 
     for (var filename in cov) {
       var data = cov[filename];