Fix trim() error when CurlHandle passed to log::add()

[brunetphilippe-prog]

Prevent PHP Fatal Error when jsonrpcClient passes cURL handle instead of string to log::add(). Add type check before trim() call in log.class.php:112.

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• 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

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• 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.

[Salvialf]

Hi @brunetphilippe-prog,

Sorry, but I don't understand what the problem is exactly ? $_message must be a string even from jsonRPC API .

Some more explanations are needed here.