premium-only cache crashes free-account user

[aapo]

Cachedownloader VERSION = 35 ('2013-08-27')

With free-account downloading premium-only cache causes several out-of-bounds exceptions.

This workaround just skips premium caches for free-account.

--- cachedownloader.py  2013-08-28 00:21:02.000000000 +0300
+++ fixed.py    2013-09-13 21:36:29.000000000 +0300
@@ -365,6 +365,14 @@
         # Basename - Image name without path and extension
         def basename(url):
             return url.split('/')[-1].split('.')[0]
+
+        #check for premium only cache 
+        try:
+            doc.get_element_by_id('ctl00_ContentBody_basicMemberMsg')
+            print "PREMIUM ONLY, skip"
+            return
+        except Exception, e:
+            print "normal cache, can continue"

         # Title
         try: