Fix is_empty() Option<String> filtering

apps/notifications/src/main.rs

@@ -46,9 +46,9 @@ impl Notifications {
         timeout: i32,
     ) -> u32 {
         let contents = Contents {
-            app_name: Some(app_name).filter(String::is_empty),
+            app_name: Some(app_name).filter(|s| !s.is_empty()),
             summary,
-            body: Some(body).filter(String::is_empty),
+            body: Some(body).filter(|s| !s.is_empty()),
             timeout: Some(timeout).filter(|t| *t == 0),
         };