Add new error condition to the HID Report Parser for when a report is parsed but no unfiltered items are encountered (i.e. nothing of interest in the device report). Make all host HID "WithParser" demos print the new error condition.

LUFA/Drivers/USB/Class/Host/HIDParser.c

@@ -296,6 +296,9 @@ uint8_t USB_ProcessHIDReport(const uint8_t* ReportData, uint16_t ReportSize, HID
 		}
 	}
 	
+	if (!(ParserData->TotalReportItems))
+	  return HID_PARSE_NoUnfilteredReportItems;
+	
 	return HID_PARSE_Successful;
 }