Small fix: Aborted connection may crash the process.

src/lib/Sympa/Database.pm

@@ -8,8 +8,8 @@
 # Copyright (c) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
 # 2006, 2007, 2008, 2009, 2010, 2011 Comite Reseau des Universites
 # Copyright (c) 2011, 2012, 2013, 2014, 2015, 2016, 2017 GIP RENATER
-# Copyright 2017, 2018, 2019 The Sympa Community. See the AUTHORS.md file at
-# the top-level directory of this distribution and at
+# Copyright 2017, 2018, 2019, 2021 The Sympa Community. See the
+# AUTHORS.md file at the top-level directory of this distribution and at
 # <https://github.com/sympa-community/sympa.git>.
 #
 # This program is free software; you can redistribute it and/or modify
@@ -108,6 +108,13 @@ sub connect {
             $self);
         return 1;
     }
+    # Disconnected: Transaction (if any) was aborted.
+    if (delete $self->{_sdbTransactionLevel}) {
+        $log->syslog('err', 'Transaction on database %s was aborted: %s',
+            $self, $DBI::errstr);
+        $self->set_persistent($self->{_sdbPrevPersistency});
+        return undef;
+    }
 
     # Do we have required parameters?
     foreach my $param (@{$self->required_parameters}) {
@@ -425,6 +432,9 @@ sub begin {
 sub _finalize_transaction {
     my $self = shift;
 
+    unless (defined $self->{_sdbTransactionLevel}) {
+        return;
+    }
     unless ($self->{_sdbTransactionLevel}) {
         die 'bug in logic. Ask developer';
     }