Exporter: Updated the logic that gives a error message (#12579)

exporter/src/main.rs

@@ -418,6 +418,8 @@ fn main() -> Result<()> {
 
     if opt.swf.is_file() {
         capture_single_swf(descriptors, &opt)?;
+    } else if !opt.swf.is_dir() {
+        return Err(anyhow!("Given path is not a file or directory."));
     } else if opt.output_path.is_some() {
         capture_multiple_swfs(descriptors, &opt)?;
     } else {