rust: handle I/O errors in process_word_file (fixes #1990)

Author: Shaik-Mudassir2001

docs/CHANGES.TXT

@@ -1,5 +1,6 @@
 0.96.5 (2026-01-05)
 -------------------
+- Fix: Rust word file parser panic when reading malformed lines (#1990)
 - New: Add support for raw CDP (Caption Distribution Packet) files (#1406)
 - New: Add --scc-accurate-timing option for bandwidth-aware SCC output (#1120)
 - Fix: MXF files containing CEA-708 captions not being detected/extracted (#1647)

src/rust/src/parser.rs

@@ -107,7 +107,16 @@ fn process_word_file(filename: &str, list: &mut Vec<String>) -> Result<(), std::
 
     for line in reader.lines() {
         num += 1;
-        let line = line.unwrap();
+        let line = match line {
+            Ok(l) => l,
+            Err(e) => {
+                eprintln!(
+                    "Error reading line {} in word file {}: {}",
+                    num, filename, e
+                );
+                continue;
+            }
+        };
         if line.starts_with('#') {
             continue;
         }