share / sharedb-mongo / 377

91%

master: 93%

Pull #100

travis-ci

Early return `close()` if already closed

It can be surprising to call `db.close()` multiple times and get an
error because we've already closed.

This change swallows the already closed error if caught in `db.close()`.

Note that a test will be added for this upstream in `sharedb`:
https://github.com/share/sharedb/pull/412

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