cli: handle NoSuchDevice exception when pinging device

lib/solaar/cli/show.py

@@ -16,6 +16,7 @@
 ## with this program; if not, write to the Free Software Foundation, Inc.,
 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+from logitech_receiver import base as _base
 from logitech_receiver import hidpp10 as _hidpp10
 from logitech_receiver import hidpp20 as _hidpp20
 from logitech_receiver import receiver as _receiver
@@ -81,8 +82,12 @@ def _battery_line(dev):
 
 def _print_device(dev, num=None):
     assert dev is not None
-    # check if the device is online
-    dev.ping()
+    # try to ping the device to see if it actually exists and to wake it up
+    try:
+        dev.ping()
+    except _base.NoSuchDevice:
+        print('  %d: Device not found' % num or dev.number)
+        return
 
     print('  %d: %s' % (num or dev.number, dev.name))
     print('     Device path  :', dev.path)