Fix: slightly correct description calculation

Author: qfox

lib/jsdoc.js

@@ -63,8 +63,11 @@ function DocComment(value, loc) {
     this.valid = _parsed.hasOwnProperty('line');
 
     // doc parsed data
-    this.description = _parsed.source && _parsed.description ?
-        _parsed.source.substr(0, _parsed.source.indexOf('\n@')) : null;
+    var _d = _parsed.source;
+    var _dog = _d && _d.indexOf('\n@');
+    this.description = !_d || _d[0] === '@' ?
+        null
+        : (_dog === -1 ? _d : _d.substr(0, _dog));
 
     this.tags = (_parsed.tags || []).map(function(tag) {
         return new DocTag(tag, new DocLocation(tag.line, 3, loc.start));