Do not allow exceptions escape when closing broken connection

[pulyaevskiy]

This addresses an issue I hit while running my server app in Docker (Swarm). Postgres was also running in the same swarm.

I was getting a "connection reset by peer" errors after a few minutes of idle operation, which seemed like were being handled by the library.

But trying to establish a new connection always resulted in a crash of my up with Unhandled exception saying "connection reset by peer" (again).

I tried to understand what's the best way to handle it inside the lib but it's still unclear to me where exactly it originates from.

The only thing that worked is adding try-catch in the _close method and silencing the error, which seems reasonable.

Note: The lib does throw PgException (which wraps the original SocketError) on a call to execute and I tried catching it, and re-creating the connection. But the SocketError reappears as unhandled later, after calling open and crashes the app completely.

[isoos]

I think this is reasonable, thank you!

[isoos]

Published as 3.4.1