Set ags temp to N/A if it isn't available

home/ags/files/Bar.tsx

@@ -80,18 +80,18 @@ function Time({ format = "%H:%M:%S" }): JSX.Element {
 }
 
 function Temp(): JSX.Element {
+    let label = Variable<string>("N/A");
     if (sensorsAvailable) {
-        const temp = Variable<string>("").poll(5000, 'sensors', out => {
+        label = Variable<string>("").poll(5000, 'sensors', out => {
             const match = out.split('\n').find(line => line.includes('Tctl') || line.includes('Package'))?.match(/[0-9.]*°C/);
             return match ? match[0] : "N/A";
         })
-        return <label
-            className="item blue"
-            onDestroy={() => temp.drop()}
-            label={temp()}
-        />
     }
-    return <box />
+    return <label
+        className="item blue"
+        onDestroy={() => label.drop()}
+        label={label()}
+    />
 }
 
 function Memory(): JSX.Element {