postfix: fixed erb template to avoid breakage when postfix_use_* variables aren't defined.

templates/master.cf.debian.erb

@@ -7,8 +7,11 @@
 # service type  private unpriv  chroot  wakeup  maxproc command + args
 #               (yes)   (yes)   (yes)   (never) (100)
 # ==========================================================================
-<% if postfix_smtp_listen == 'all' %>smtp      inet  n       -       -       -       -       smtpd
-<% else %><%= postfix_smtp_listen %>:smtp      inet  n       -       -       -       -       smtpd<% end %>
+<% if postfix_smtp_listen == 'all' -%>
+smtp      inet  n       -       -       -       -       smtpd
+<% else -%>
+<%= postfix_smtp_listen %>:smtp      inet  n       -       -       -       -       smtpd
+<% end -%>
 #submission inet n       -       -       -       -       smtpd
 #  -o smtpd_enforce_tls=yes
 #  -o smtpd_sasl_auth_enable=yes
@@ -75,7 +78,7 @@ scalemail-backend unix	-	n	n	-	2	pipe
 mailman   unix  -       n       n       -       -       pipe
   flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
   ${nexthop} ${user}
-<% if postfix_use_amavisd == 'yes' %>
+<% if has_variable?("postfix_use_amavisd") and postfix_use_amavisd == 'yes' %>
 amavis unix - - - - 2 smtp
         -o smtp_data_done_timeout=1200
         -o smtp_send_xforward_command=yes
@@ -93,18 +96,18 @@ amavis unix - - - - 2 smtp
         -o strict_rfc821_envelopes=yes
         -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
         -o smtpd_bind_address=127.0.0.1
-<% end %>
-<% if postfix_use_dovecot_lda == 'yes' %>
+<% end -%>
+<% if has_variable?("postfix_use_dovecot_lda") and postfix_use_dovecot_lda == 'yes' %>
 dovecot   unix  -       n       n       -       -       pipe
   flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -d ${recipient}
-<% end %>
-<% if postfix_use_schleuder == 'yes' %>
+<% end -%>
+<% if has_variable?("postfix_use_schleuder") and postfix_use_schleuder == 'yes' %>
 schleuder  unix  -       n       n       -       -       pipe
   flags=DRhu user=schleuder argv=/usr/bin/schleuder ${user}
-<% end %>
-<% if postfix_use_sympa == 'yes' %>
+<% end -%>
+<% if has_variable?("postfix_use_sympa") and postfix_use_sympa == 'yes' %>
 sympa        unix  -       n       n       -       -       pipe
   flags=R user=sympa argv=/usr/lib/sympa/bin/queue ${recipient}
 sympabounce  unix  -       n       n       -       -       pipe
   flags=R user=sympa argv=/usr/lib/sympa/bin/bouncequeue ${user}
-<% end %>
+<% end -%>