[Merge] lp:~thomas-voss/platform-api/fix-1338610 into lp:platform-api

[Charles Kerr]

Review: Approve

I'd forgotten that there are alphabetical equivalents of the bitwise operators, so "if (not session)" sent me reaching for my C++ book... :)

Anyway, the code looks straightforward and reasonable, nice to see e.what() logged when available.
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https://code.launchpad.net/~thomas-voss/platform-api/fix-1338610/+merge/228567
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