fix identify empty optical drive

ChangeLog

@@ -7,6 +7,7 @@
     improve denied 94 msg #24
     default fmask=0133 for vfat ntfs msdos umsdos #25
     [devmon 1.1.7] support raid /dev/mda in partition detection #28
+    fix identify empty optical drive
 0.4.1   2013-03-17:
     update Russian translation
     added translation files to transifex.com

src/device-info.c

@@ -1174,7 +1174,9 @@ void info_optical_disc( device_t *device )
 {
     const char *cdrom_disc_state;
 
-    if ( udev_device_get_property_value( device->udevice, "ID_CDROM_MEDIA") )
+    const char* optical_state = udev_device_get_property_value( device->udevice,
+                                                                "ID_CDROM");
+    if ( optical_state && atoi( optical_state ) != 0 )
     {
         device->device_is_optical_disc = TRUE;