Fixing issue #873. IAM Users/Groups/Roles with an attached  managed policy with zero issues causing an exception.
Fixing issue #873. IAM Users/Groups/Roles with an attached
 managed policy with zero issues causing an exception.

 Upstream Patch https://github.com/Netflix/security_monkey/commit/723f75023e20e78f6926a4262af07f223a9c780c

stackArmor/security_monkey,stackArmor/security_monkey,stackArmor/security_monkey,stackArmor/security_monkey,stackArmor/security_monkey