Add an already exist observable returns an unexpected error

[To-om]

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	Debian
OS version (client)	Debian
TheHive version / git hash	2.9.1
Package Type	From source
Browser type & version	Firefox

Problem Description

If you try to add an observable and if it already exists, TheHive returns an unexpected error

Steps to Reproduce

1. In a case, add an observable: domain / thehive-project.org
2. In the same case add again an observable: domain / thehive-project.org
3. An error is shown with message: "ObservableCreationCtrl: An unexpected error occured while creating the observables"