protect function system::fuserk

[Mips2648]

Description

Some plugins call system::fuserk(jeedom::getUsbMapping($port)); but jeedom::getUsbMapping($port) will return an array if port is an empty string and then we got error Erreur sur la fonction deamon_start du plugin : file_exists(): Argument #1 ($filename) must be of type string, array given exemple: https://community.jeedom.com/t/dsm7-docker-erreurs-sur-plugins-protocole-domotique/127102

so the goal of this PR is to protect system::fuserk function by validating argument

Suggested changelog entry

• bugfix debian12

issue:

2561

Types of changes

• [X] 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

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