Fix broken output pane caused by lines with hashtags only (#590)

crates/ark/src/lsp/symbols.rs

@@ -127,6 +127,9 @@ fn parse_comment_as_section(comment: &str) -> Option<(usize, String)> {
     if let Some(caps) = indexer::RE_COMMENT_SECTION.captures(comment) {
         let hashes = caps.get(1)?.as_str().len(); // Count the number of '#'
         let title = caps.get(2)?.as_str().trim().to_string(); // Extract the title text without trailing punctuations
+        if title.is_empty() {
+            return None; // Return None for lines with only hashtags
+        }
         return Some((hashes, title)); // Return the level based on the number of '#' and the title
     }
 
@@ -332,6 +335,7 @@ mod tests {
     fn test_symbol_parse_comment_as_section() {
         assert_eq!(parse_comment_as_section("# foo"), None);
         assert_eq!(parse_comment_as_section("# foo ---"), None);
+        assert_eq!(parse_comment_as_section("########"), None);
         assert_eq!(
             parse_comment_as_section("# foo ----"),
             Some((1, String::from("foo")))
@@ -342,6 +346,7 @@ mod tests {
     fn test_symbol_comment_sections() {
         assert_eq!(test_symbol("# foo"), vec![]);
         assert_eq!(test_symbol("# foo ---"), vec![]);
+        assert_eq!(test_symbol("########"), vec![]);
 
         let range = Range {
             start: Position {