fix test expression result

[Mips2648]

Description

For the moment, when a user evaluate a simple command, the result give a small warning about a potential issue which doesn't exist, example:

It confuses a lot users, some even try to find solutions for a problem that does not exist: https://community.jeedom.com/t/retex-message-log-general/149045
In the case above, we expect to not get any warning message

Suggested changelog entry

Correction du testeur d'expression pour ne plus signaler un problème qui n'existe pas

Related issues/external references

Fixes #

Types of changes

• Bug fix (non-breaking change which fixes)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the [La ligne directrice pour contribuer à ce projet / Contribution guidelines for this project).
• I grant the project the right to include and distribute the code under the GNU.
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added MD documentation for the sniff.

Tests

true case:

a numeric:

error case:

random incorrect value: