[Orchestrator] - Fix the array verification in case signature is not being fulfilled within a mail template.

Description

If the mail template does not contain a signature, the array verification must not take that into account while fusionning the signature and the body to generate the final email.

Distribution Name and Version

Centos 7

FusionDirectory Version

0.9-fixes orchestrator

Plugin with the defect

Orchestrator

PHP version used

7.3

Origin of php packages

Source

Steps to Reproduce

1. [First Step]
2. [Second Step]
3. [and so on...]

Expected behavior:

No error thrown if no signature exists.

Actual behavior:

Error appears if no signature are fulfilled in mail template.

Reproduces how often:

100 %

Additional Information