slaprunner: Skip if slappart0 wasn't configured

  This means the user don't have any instance at this point.

software/slaprunner/buildout.hash.cfg

@@ -22,7 +22,7 @@ md5sum = dc3a7734b08977f438b35d441a12f628
 
 [template-runner-import-script]
 filename = template/runner-import.sh.jinja2
-md5sum = fc22e2d2f03ce58631f157a5b4943e15
+md5sum = 2852689640b632fc713d7a603ce66207
 
 [instance-runner-import]
 filename = instance-runner-import.cfg.in

software/slaprunner/template/runner-import.sh.jinja2

@@ -161,6 +161,12 @@ DB_SOFTWARE_TABLE=$(db_query ".table software__")
 # XXX hardcoded
 PARTITION=$(basename $HOME)
 OLD_SOFTWARE_RELEASE=$(db_query "select software_release from $DB_PARTITION_TABLE where reference='slappart0';")
+if [ "$OLD_SOFTWARE_RELEASE" == "" ];
+then
+   echo "No instance configured"
+   echo 0 > $RESTORE_EXIT_CODE_FILE
+   exit 0
+fi
 SOFTWARE_RELEASE=$({{ sys.executable }} - $OLD_SOFTWARE_RELEASE $PARTITION <<EOF
 if 1:
   import os, re, sys