Fill in vendor and model names using Solid's udev backend when possible.

REVIEW: 101270
(cherry picked from commit fdf93b29)

solid/solid/backends/udev/udevdevice.cpp

@@ -71,12 +71,15 @@ QString UDevDevice::vendor() const
              vendor = m_device.deviceProperty("ID_VENDOR").toString().replace('_', " ");
          }  else if (queryDeviceInterface(Solid::DeviceInterface::NetworkInterface)) {
              vendor = m_device.deviceProperty("ID_VENDOR_FROM_DATABASE").toString();
-         }
-         else if (queryDeviceInterface(Solid::DeviceInterface::AudioInterface)) {
+         } else if (queryDeviceInterface(Solid::DeviceInterface::AudioInterface)) {
              if (m_device.parent().isValid()) {
                  vendor = m_device.parent().deviceProperty("ID_VENDOR_FROM_DATABASE").toString();
              }
          }
+
+         if (vendor.isEmpty()) {
+             vendor = m_device.deviceProperty("ID_VENDOR").toString().replace('_', ' ');
+         }
     }
     return vendor;
 }
@@ -111,6 +114,10 @@ QString UDevDevice::product() const
                 product.append(QLatin1String("USB Serial Port"));
             }
         }
+
+        if (product.isEmpty()) {
+            product = m_device.deviceProperty("ID_MODEL").toString().replace('_', ' ');
+        }
     }
     return product;
 }

solid/solid/backends/udev/udevmanager.cpp

@@ -191,7 +191,7 @@ QObject *UDevManager::createDevice(const QString &udi_)
     }
     const QString udi = udi_.right(udi_.size() - udiPrefix().size());
     UdevQt::Device device = d->m_client->deviceBySysfsPath(udi);
-    if (d->isOfInterest(device)) {
+    if (d->isOfInterest(device) || QFile::exists(udi)) {
         return new UDevDevice(device);
     }
     return 0;