Fix bug with backwards compatibility for shadowSize = 0 (report and suggested fix by aspinak)

git-svn-id: https://flot.googlecode.com/svn/trunk@285 1e0a6537-2640-0410-bfb7-f154510ff394

NEWS.txt

@@ -114,6 +114,8 @@ Bug fixes:
 - Fix bug with using aboveData with a background (reported by
   amitayd).
 - Fix possible excanvas leak (report and suggested fix by tom9729).
+- Fix bug with backwards compatibility for shadowSize = 0 (report and
+  suggested fix by aspinak).
 
 
 Flot 0.6

jquery.flot.js

@@ -281,7 +281,7 @@
                 $.extend(true, options.series.points, options.points);
             if (options.bars)
                 $.extend(true, options.series.bars, options.bars);
-            if (options.shadowSize)
+            if (options.shadowSize != null)
                 options.series.shadowSize = options.shadowSize;
 
             for (i = 0; i < options.xaxes.length; ++i)