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Crash when database connection is lost

See original GitHub issue

We had the issue, that etherpad shuts down, when the database connection was lost (for example due to a database server restart).

Etherpad version: 1.3.0 Node version: 0.8.26 (There were some issues with newer versions)

Reproduce: Use etherpad with mysql/postgresql shutdown database

Log with postgresql:

[2014-03-03 15:39:57.699] [ERROR] console - error: terminating connection due to administrator command
    at Connection.parseE (/Users/timowelde/Documents/workspaces/etherpad/etherpad-lite/src/node_modules/ueberDB/node_modules/pg/lib/connection.js:508:11)
    at Connection.parseMessage (/Users/timowelde/Documents/workspaces/etherpad/etherpad-lite/src/node_modules/ueberDB/node_modules/pg/lib/connection.js:368:17)
    at Socket.Connection.attachListeners (/Users/timowelde/Documents/workspaces/etherpad/etherpad-lite/src/node_modules/ueberDB/node_modules/pg/lib/connection.js:84:20)
    at Socket.EventEmitter.emit (events.js:96:17)
    at TCP.onread (net.js:397:14)
[2014-03-03 15:39:57.699] [INFO] console - graceful shutdown...
[2014-03-03 15:39:57.699] [INFO] console - db sucessfully closed.

Log with mysql:

[2014-03-03 15:37:19.249] [ERROR] console - Error: connect ECONNREFUSED
    at errnoException (net.js:770:11)
    at Object.afterConnect [as oncomplete] (net.js:761:19)
[2014-03-03 15:37:19.249] [INFO] console - graceful shutdown...
[2014-03-03 15:37:19.274] [INFO] console - db sucessfully closed.

Edit: added steps to reproduce, detailed log for postgres, added log for mysql, used code blocks, accidentally closed the issue