Add id3 extractor

crates/pile-dataset/src/extract/pdf/pdf_text.rs

@@ -23,6 +23,10 @@ impl<'a> PdfTextExtractor<'a> {
 			return Ok(x);
 		}
 
+		if self.item.path.extension().map(|x| x.to_str()).flatten() != Some("pdf") {
+			return Ok(self.output.get_or_init(|| HashMap::new()));
+		}
+
 		let file = FileOptions::cached()
 			.open(&self.item.path)
 			.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e.to_string()))?;