Don't stop reporting/Destroying, even if something bad happens to an instance.

Do it as well for the reporting loop.

slapos/grid/slapgrid.py

@@ -876,6 +876,7 @@ class Slapgrid(object):
     #Now we loop through the different computer partitions to report
     report_usage_issue_cp_list = []
     for computer_partition in computer_partition_list:
+      try:
         filename_delete_list = []
         computer_partition_id = computer_partition.getId()
         instance_path = os.path.join(self.instance_root, computer_partition_id)
@@ -917,6 +918,14 @@ class Slapgrid(object):
         for filename in filename_delete_list:
           os.remove(os.path.join(dir_reports, filename))
 
+      # Whatever happens, don't stop processing other instances
+      except Exception:
+        computer_partition_id = computer_partition.getId()
+        exception = traceback.format_exc()
+        issue = "Cannot run usage script(s) for %r: %s" % (
+            computer_partition_id, exception)
+        logger.info(issue)
+
     for computer_partition_usage in computer_partition_usage_list:
       logger.info('computer_partition_usage_list : %s - %s' % \
         (computer_partition_usage.usage, computer_partition_usage.getId()))