trellis-ldp / trellis-ext-db / 257

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Pull #15

travis-ci-com

Handle empty and duplicate namespace definitions

In highly concurrent contexts, the INSERT INTO command with the same
values can be executed concurrently, leading to duplicate key
exceptions. This change makes two adjustments:

1. It is a common pattern to add an empty namespace prefix, referring to
   the current document, but that is problematic across resources, so
   those declarations are ignored
2. A StatementException is caught and logged but does not cause the
   entire request to fail

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