Fix Windows build crashing because virtual_mic is Option Device not just Device (not inside let Some)

src/windows_lib.rs

@@ -2,8 +2,9 @@ use rodio::{
     OutputStream, OutputStreamBuilder,
     cpal::{self, traits::{DeviceTrait, StreamTrait, HostTrait}, StreamConfig, SampleRate},
 };
-
+use rfd::{MessageButtons, MessageDialog, MessageDialogResult};
 use ringbuf::{traits::*, HeapRb};
+use std::process;
 
 fn route_standard_to_virtual(host: &cpal::Host, virtual_mic: &cpal::Device) {
     let standard_mic = host.default_input_device().expect("Could not get default input device.");
@@ -56,9 +57,9 @@ pub fn create_virtual_mic_windows() -> (OutputStream, OutputStream) {
                 .ok()
                 .map(|name| name.contains("CABLE Input") || name.contains("VB-Audio"))
                 .unwrap_or(false)
-        })
+        });
-        .expect("Could not get VB Cable output device. Is VB Cable Driver installed?");
 
+    if let Some(virtual_mic) = virtual_mic {        
         route_standard_to_virtual(&host, &virtual_mic);
 
         let normal_output = host
@@ -76,3 +77,13 @@ pub fn create_virtual_mic_windows() -> (OutputStream, OutputStream) {
                 .expect("Failed to open stream"),
         );
     }
+    else {
+        MessageDialog::new()
+            .set_title("VB Cable Driver not installed.")
+            .set_description("Could not access VB Cable output device. Is VB Cable Driver installed?")
+            .set_buttons(MessageButtons::Ok)
+            .show();
+
+        std::process::exit(1);
+    }
+}