fix: show empty dropdown menu when no app uses dGPU

Author: GroobleDierne

cosmic-applet-battery/src/dgpu.rs

@@ -222,7 +222,11 @@ impl Gpu {
                 Some(
                     smi_output
                         .lines()
-                        .filter(|line| !line.starts_with('#'))
+                        .filter(|line| {
+                            // smi shows an empty line filled with - when no app is running
+                            let components = line.split_whitespace().collect::<Vec<_>>();
+                            components[1].trim().ne("-") && !line.starts_with('#')
+                        })
                         .map(|line| {
                             let components = line.split_whitespace().collect::<Vec<_>>();
                             let pid = components[1].trim();