-Piece of fix for bug 1965012, server process dying when malformed request passed to table layer

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@1426 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT-2.0/xCAT/Table.pm

@@ -1498,6 +1498,9 @@ sub getAttribs
     }
     $statement .= "(\"disable\" is NULL or \"disable\" in ('0','no','NO','No','nO'))";
     my $query = $self->{dbh}->prepare($statement);
+    unless (defined $query) {
+        return undef;
+    }
     $query->execute(@exeargs);
     my $data;
     while ($data = $query->fetchrow_hashref())