[openstreetmap/openstreetmap-website] 500 error when click edit if history of deleted way url active (#1430)

[EdLoach]

Take as an example [this way](http://www.openstreetmap.org/way/130344453/history) and try clicking edit. It also seems to occur most times when you just have [a deleted way](http://www.openstreetmap.org/way/130344453) link visible (I'm sure I had at least one time where it did work). 

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