"Error Querying Menu" when setting value

[alvarop]

There seem to be cases in v4l2 devices where the menu options are not contiguous. For example (Logitech C920 v4l2-ctl -L output):

                 exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=1
   			1: Manual Mode
   			3: Aperture Priority Mode

When trying to change this setting here it cycles through each menu item to compare it with the input text. Since indexes 0 and 2 don't have test, the error message is printed out.

I'd suggest not printing out an error there since it's not really a problem and if the value doesn't match it will be caught below. Maybe a warning or a message would be more appropriate if something must be printed out at all.