Use tryint() for stats value

In some cases the value is [not set], in this case
the conversion to integer does not work.

Closes-Bug: #1970431
Change-Id: I74df7d8bc9f5cbe0709a6471cf7639caea0b58e8

Author: hjensas

tools/get-stats.py

@@ -31,7 +31,7 @@ def get_service_stats(service):
         if not line:
             continue
         stat, val = line.split('=')
-        stats[stat] = int(val)
+        stats[stat] = tryint(val)
 
     return stats