Small Bugfixes

Details:

Bug: CwebpShellExecutionFailed Exception Misconfiguration

• Issue: When transitioning to the Process class for shell execution, the CwebpShellExecutionFailed exception was not correctly configured to handle an array input, leading to improper error handling.
• Fix: Updated the CwebpShellExecutionFailed exception to properly expect and handle an array input, ensuring accurate error reporting and handling during the Process execution.