erp5: Fix disabling repozo backup when backup-periodiciy='never'.

stack/erp5/buildout.cfg

@@ -301,7 +301,7 @@ md5sum = ff8ecdc258e2529b3979fd6596a27b95
 [template-zeo]
 < = download-base
 filename = instance-zeo.cfg.in
-md5sum = 9670cf63099e2c520017a23defff51a4
+md5sum = d1cf938074b4b2f407122a40991bfef2
 
 [template-zope]
 < = download-base

stack/erp5/instance-zeo.cfg.in

@@ -119,6 +119,7 @@ tidstorage-ip =
 tidstorage-port =
 {% endif -%}
 
+{% if len(known_tid_storage_identifier_dict) > 1 -%}
 # Used for ERP5 resiliency or (more probably)
 # webrunner resiliency with erp5 inside.
 [{{ section("resiliency-exclude-file") }}]
@@ -170,6 +171,7 @@ input = inline: #!/bin/sh
   exit $EXIT_CODE
 output = ${directory:srv}/runner-import-restore
 mode = 755
+{% endif -%}
 
 [directory]
 recipe = slapos.cookbook:mkdirectory