PermissionRange: Interpret allowMin > allowMax as disallow

Set min and max to 0 if min > max.

Bug: Issue 11059
Change-Id: I492ef61322dfb82273dc1ed1fe6ae86640541f11

java/com/google/gerrit/common/data/PermissionRange.java

@@ -70,8 +70,8 @@ public class PermissionRange implements Comparable<PermissionRange> {
       this.min = min;
       this.max = max;
     } else {
-      this.min = max;
-      this.max = min;
+      this.min = 0;
+      this.max = 0;
     }
   }