Handle zero min_instances

Author: jaydesl

pk_helper.py

@@ -1,9 +1,5 @@
-
-
-
 def limit_instances(count,cmin,cmax):
-  cmin = 1 if not cmin else int(cmin)
-  cmax = cmin if not cmax else max(int(cmax),cmin)
-  count = max(min(int(count),cmax),cmin) if count else cmin
-  return count,cmin,cmax
-
+  cmin = 1 if cmin is None else int(cmin)
+  cmax = cmin if cmax is None else max(int(cmax),cmin)
+  count = cmin if count is None else max(min(int(count),cmax),cmin)
+  return count,cmin,cmax