fix: when first prop is a string lookup

Author: remy

lib/undefsafe.js

@@ -18,7 +18,10 @@ function undefsafe(obj, path, value) {
           i++;
           c = path.substr(i, 1);
         }
-        res.push(key);
+
+        if (key) { // the first value could be a string
+          res.push(key);
+        }
         key = '';
         continue;
       }

test/undefsafe.test.js

@@ -66,6 +66,13 @@ test('should find properties with periods in them', function (t) {
   r = undefsafe(value, `a['one.two.and\three'].1`);
   t.equal(r, true, 'combo: ' + r);
 
+  value = {
+    'one.two': true
+  };
+
+  r = undefsafe(value, `['one.two']`);
+  t.equal(r, true, 'root: ' + r);
+
   t.end();
 });