fix(formatter): Prevent panic on empty log message

src/widget/standard_formatter.rs

@@ -116,7 +116,7 @@ impl LogFormatter for LogStandardFormatter {
         }
         let mut sublines: Vec<&str> = evt.msg().lines().rev().collect();
 
-        output.push_str(sublines.pop().unwrap());
+        output.push_str(sublines.pop().unwrap_or(""));
         self.append_wrapped_line(col_style, 9, &mut lines, &output, width, false);
 
         for subline in sublines.iter().rev() {

tests/empty_log.rs

@@ -0,0 +1,28 @@
+use log::*;
+use ratatui::{backend::TestBackend, layout::Rect, Terminal};
+use tui_logger::*;
+
+#[test]
+fn test_panic_on_empty_log() {
+    let _ = init_logger(LevelFilter::Trace);
+    set_default_level(LevelFilter::Trace);
+
+    info!("");
+    move_events();
+
+    let backend = TestBackend::new(40, 3);
+    let mut terminal = Terminal::new(backend).unwrap();
+    let res = terminal.draw(|f| {
+        let tui_logger_widget = TuiLoggerWidget::default().output_timestamp(None);
+        f.render_widget(
+            tui_logger_widget,
+            Rect {
+                x: 0,
+                y: 0,
+                width: 40,
+                height: 3,
+            },
+        );
+    });
+    assert!(res.is_ok());
+}