just print message for impl Display

src/lib.rs

@@ -37,11 +37,7 @@ impl Rear {
 
 impl Display for Rear {
 	fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
-		if !self.message.is_empty() {
+		write!(f, "{}", &self.message)
-			write!(f, "{}", self.error)
-		} else {
-			write!(f, "{}\n{}", &self.message, &self.error)
-		}
 	}
 }