pgsql: Fix crash in psql when attempting to reuse old connection

Fix crash in psql when attempting to reuse old connection In a psql session, if the connection to the server is abruptly cut, the referenced connection would become NULL as of CheckConnection(). This could cause a hard crash with psql if attempting to connect by reusing the past connection's data

pgsql: Fix crash in psql when attempting to reuse old connection

Fix crash in psql when attempting to reuse old connection In a psql session, if the connection to the server is abruptly cut, the referenced connection would become NULL as of CheckConnection(). This could cause a hard crash with psql if attempting to connect by reusing the past connection's data