log when feedback.read fails

src/gui.rs

@@ -357,12 +357,17 @@ impl Feedback {
 
    fn read(&mut self) -> Option<String> {
       return match &self.cfg.url {
-         Some(url) => match reqwest::blocking::get(url) {
+         Some(url) => {
+            match reqwest::blocking::get(url) {
                Ok(resp) => match resp.text() {
                   Ok(text) => Some(text),
                   _ => None,
                },
-            _ => None,
+               Err(err) => {
+                  eprintln!("feedback.read: cannot fetch: {}", err);
+                  None
+               },
+            }
          },
          _ => None,
       };