fix: Handle Empty Audio Files Gracefully (GH-20)

[mbsantiago]

This PR addresses issue #20, where the batdetect CLI encountered errors when processing empty audio files. This scenario is common with AudioMoth devices experiencing low battery, as they may generate empty recordings.

To prevent a single empty file from halting the entire detect command:

• Improved error handling: Added EOFError to the list of expected exceptions when reading audio file metadata. This error occurs when attempting to determine the sample rate of an empty file.
• Better user feedback: The detect command now gracefully handles empty files, adding them to the list of problematic files and reporting them to the user upon completion.
• Added test case: Created a new test case that specifically runs the detect command on an empty file, ensuring it no longer causes a failure.

Acknowledgments:

Thanks to @EvansMike for reporting this issue and providing valuable feedback.