Fix dbTransaction for iOS 8.1
Fix dbTransaction for iOS 8.1

The indexedDB interface is present but
calling `indexedDB.open(..)` just [returns `null`][1].
So in this case we just return the fake DB.

[1]: https://stackoverflow.com/questions/27415998/indexeddb-open-returns-null-on-safari-ios-8-1-1-and-halts-execution-on-cordova

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