[Bug report] pgAdmin 1.22.1 crashes when connection lost

<p style="line-height: 16px; font-size: 13px; font-family: Tahoma, sans-serif; margin: 16px 0px;" valid="true"><p
style="line-height:16px; font-size: 13px; font-family: Tahoma, sans-serif; margin: 16px 0px;" valid="true"><p
style="line-height:16px; font-size: 13px; font-family: Tahoma, sans-serif; margin: 16px 0px;" valid="true">pgAdmin
1.22.1 crasheswhen a connection is established, then lost and the user tries to click somewhere in the DB tree.<p
style="line-height:16px; font-size: 13px; font-family: Tahoma, sans-serif; margin: 16px 0px;" valid="true">pgAdmin
1.22.1<br/>OS: Windows 10 (happens on Windows 7 and Mac OS X 1.10.4)<p style="line-height: 16px; font-size: 13px;
font-family:Tahoma, sans-serif; margin: 16px 0px;" valid="true">To reproduce:<p style="line-height: 16px; font-size:
13px;font-family: Tahoma, sans-serif; margin: 16px 0px;" valid="true">1. Start pgAdmin and open a DB connection<br />2.
Expandto some scheme and click on any table to populate properties pane<br />3. Simulate connectivity lost (turn off
Wifi,pull LAN cable). Do NOT re-connect<br />4. In pgAdmin DB explorer click on another table<br />5. pgAdmin appears
busyfor a while then notifies for server error with a dialog box "An error has occurred: server closed the connection
unexpectedly"<br/>6. On pressing OK in the message box, pgAdmin crashed<p style="line-height: 16px; font-size: 13px;
font-family:Tahoma, sans-serif; margin: 16px 0px;" valid="true">This is a regression since 1.18, where pgAdmin would
showthe reconnect Yes/No message box.<p style="line-height: 16px; font-size: 13px; font-family: Tahoma,sans-serif;
margin:16px 0px;" valid="true"><br /><br />-------------------------------------<br /><a
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