[openstreetmap/openstreetmap-website] 500 error on github login possible (#1265)

[Thomas Pointhuber]

## HowTo reproduce:

1.) register osm account with some email address.
2.) register another osm account using github (which points to another email address)
3.) add email address of first osm account to github
4.) try to login via github

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https://github.com/openstreetmap/openstreetmap-website/issues/1265
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