[Bug report] pgAdmin 1.22.1 crashes when connection lost

pgAdmin 1.22.1 crashes when a connection is established, then lost and the
user tries to click somewhere in the DB tree.

pgAdmin 1.22.1
OS: Windows 10 (happens on Windows 7 and Mac OS X 1.10.4)

To reproduce:

1. Start pgAdmin and open a DB connection
2. Expand to some scheme and click on any table to populate properties
pane
3. Simulate connectivity lost (turn off Wifi, pull LAN cable). Do NOT
re-connect
4. In pgAdmin DB explorer click on another table
5. pgAdmin appears busy for a while then notifies for server error with a
dialog box "An error has occurred: server closed the connection
unexpectedly"
6. On pressing OK in the message box, pgAdmin crashed

This is a regression since 1.18, where pgAdmin would show the reconnect
Yes/No message box.

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