Fix the blank line when there are no breakpoints or symbols

src/main.rs

@@ -465,8 +465,12 @@ fn main() -> Result<(), ReplError> {
                     }
                 }
                 out.pop(); // Remove trailing newline
+                if out.is_empty() {
+                    Ok(Some("No symbols".to_string()))
+                } else {
                     Ok(Some(out))
                 }
+            }
         },
     )
     .with_command(
@@ -523,8 +527,12 @@ fn main() -> Result<(), ReplError> {
                     }
                 }
                 out.pop();
+                if out.is_empty() {
+                    Ok(Some("No breakpoints".to_string()))
+                } else {
                     Ok(Some(out))
                 }
+            }
         },
     )
     .with_command(