From 368688928317d4496f42064379d3a295f5c82c05 Mon Sep 17 00:00:00 2001
From: David Lane <dvdln@users.noreply.github.com>
Date: Wed, 26 Feb 2014 12:12:43 -0500
Subject: [PATCH] Assume missing map names means name hasn't changed

If the original source map doesn't specify a name for location then assume that the name hasn't changed from the original source. In that case, use the current name detected by UglifyJS' AST.
---
 lib/sourcemap.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/sourcemap.js b/lib/sourcemap.js
index 8e86ebd8..b42c45f8 100644
--- a/lib/sourcemap.js
+++ b/lib/sourcemap.js
@@ -67,7 +67,9 @@ function SourceMap(options) {
             source = info.source;
             orig_line = info.line;
             orig_col = info.column;
-            name = info.name;
+            if (info.name) {
+                name = info.name;
+            }
         }
         generator.addMapping({
             generated : { line: gen_line + options.dest_line_diff, column: gen_col },