[show command] allow warm restart table contains empty restore_count (s…

…onic-net#385)

* [show command] allow warm restart table contains empty restore_count

In practice, a software bug could cause not having restore_count, and
we could have use case (e.g. warm-shutdown) has state without
restore_count.

It would be nice that the command show all these rows without exception.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

* Remove extra spaces

show/main.py

@@ -1624,9 +1624,12 @@ def remove_prefix(text, prefix):
  entry = db.get_all(db.STATE_DB, tk)
  r = []
  r.append(remove_prefix(tk, prefix))
- r.append(entry['restore_count'])
+ if 'restore_count' not in entry:
+ r.append("")
+ else:
+ r.append(entry['restore_count'])
 
- if 'state' not in  entry:
+ if 'state' not in entry:
  r.append("")
  else:
  r.append(entry['state'])