Ignore files without a file extension as well

src/main.rs

@@ -92,6 +92,8 @@ fn lint_file_name(file: &DirEntry, filename: &str) -> ComplianceStatus {
         if !VIDEO_EXTENSIONS.contains(&ext.to_str().unwrap()) {
             return ComplianceStatus::Ignored;
         }
+    } else {
+        return ComplianceStatus::Ignored;
     }
 
     let captures = regex::Regex::new(SERIES_REGEX).unwrap().captures(filename);