don't create empty lines in recovery template

templates/recovery.conf

@@ -1,47 +1,47 @@
-<% if @restore_command %>
+<% if @restore_command -%>
 restore_command = '<%= @restore_command %>'
-<% end %>
-<% if @archive_cleanup_command %>
+<% end -%>
+<% if @archive_cleanup_command -%>
 archive_cleanup_command = '<%= @archive_cleanup_command %>'
-<% end %>
-<% if @recovery_end_command %>
+<% end -%>
+<% if @recovery_end_command -%>
 recovery_end_command = '<%= @recovery_end_command %>'
-<% end %>
+<% end -%>
 
-<% if @recovery_target_name %>
+<% if @recovery_target_name -%>
 recovery_target_name = '<%= @recovery_target_name %>'
-<% end %>
-<% if @recovery_target_time %>
+<% end -%>
+<% if @recovery_target_time -%>
 recovery_target_time = '<%= @recovery_target_time %>'
-<% end %>
-<% if @recovery_target_xid %>
+<% end -%>
+<% if @recovery_target_xid -%>
 recovery_target_xid = '<%= @recovery_target_xid %>'
-<% end %>
-<% if @recovery_target_inclusive %>
+<% end -%>
+<% if @recovery_target_inclusive -%>
 recovery_target_inclusive = <%= @recovery_target_inclusive %>
-<% end %>
-<% if @recovery_target %>
+<% end -%>
+<% if @recovery_target -%>
 recovery_target = '<%= @recovery_target %>'
-<% end %>
-<% if @recovery_target_timeline %>
+<% end -%>
+<% if @recovery_target_timeline -%>
 recovery_target_timeline = '<%= @recovery_target_timeline %>'
-<% end %>
-<% if @pause_at_recovery_target %>
+<% end -%>
+<% if @pause_at_recovery_target -%>
 pause_at_recovery_target = <%= @pause_at_recovery_target %>
-<% end %>
+<% end -%>
 
-<% if @standby_mode %>
+<% if @standby_mode -%>
 standby_mode = <%= @standby_mode %>
-<% end %>
-<% if @primary_conninfo %>
+<% end -%>
+<% if @primary_conninfo -%>
 primary_conninfo = '<%= @primary_conninfo  %>'
-<% end %>
-<% if @primary_slot_name %>
+<% end -%>
+<% if @primary_slot_name -%>
 primary_slot_name = '<%= @primary_slot_name %>'
-<% end %>
-<% if @trigger_file %>
+<% end -%>
+<% if @trigger_file -%>
 trigger_file = '<%= @trigger_file %>'
-<% end %>
-<% if @recovery_min_apply_delay %>
+<% end -%>
+<% if @recovery_min_apply_delay -%>
 recovery_min_apply_delay = <%= @recovery_min_apply_delay %>
-<% end %>
+<% end -%>