Refactor header line condition to avoid None unwrap

If the test source file doesn't contain any headers, or
that are not added till now then the header value
will be None and becomes panic

Signed-off-by: Muhammad Mahad <[email protected]>

src/header.rs

@@ -20,7 +20,9 @@ pub fn parse_additional_options(code: &str) -> Vec<HeaderLine> {
             continue;
         }
         if is_header_line(line) {
-            headers.push(add_additional_options(line, line_number).unwrap());
+            if let Some(header_info) = add_additional_options(line, line_number) {
+                headers.push(header_info);
+            }
         }
     }
     headers