The issue can be seen in action at
This page works fine in Chrome and Firefox (but not in IE, maybe because of another issue). In Safari and Opera (where the shim is supposed to kick in, it is giving some error by not creating the object stores (or tables) at all.
It seems that the line 1389:
var implementation = initializeIndexedDb();
is returning implementation as NONE (0) instead of SHIM (6) and that could be the reason for the error.
Please let me know if you would like any more details on this.