[Bug] Can add a "space" as observable

[KRUXLEX]

Request Type

Work Environment

Question	Answer
OS version (server)	Debian, ...
OS version (client)	https://rpm.thehive-project.org/release/noarch
Virtualized Env.	True
Dedicated RAM	64 GB
vCPU	16 /
TheHive version / git hash	4.17
Package Type	Docker
Database	Cassandra
Index type	Elasticsearch
Attachments storage	Local
Browser type & version	Firefox

Problem Description

When you manually ad multiple observable and dome ware in the middle are empty lines, the hive adding a multiple whitespace observable:

Steps to Reproduce

1. Go to any case you want
2. Go to observable
3. Click to add observable
4. Put some data with empty line
   1.Add... And see:

Possible Solutions

Regex fix?

Complementary information

Everything is up.