LedDeviceFile now defaults to /dev/null if the output is omitted.

libsrc/leddevice/LedDeviceFactory.cpp

@@ -277,7 +277,7 @@ LedDevice * LedDeviceFactory::construct(const Json::Value & deviceConfig)
   }
 	else if (type == "file")
 	{
-		const std::string output = deviceConfig["output"].asString();
+		const std::string output = deviceConfig.get("output", "/dev/null").asString();
 		device = new LedDeviceFile(output);
 	}
 	else if (type == "fadecandy")

libsrc/leddevice/LedDeviceFile.cpp

@@ -3,7 +3,7 @@
 #include "LedDeviceFile.h"
 
 LedDeviceFile::LedDeviceFile(const std::string& output) :
-	_ofs(output.empty()?"/home/pi/LedDevice.out":output.c_str())
+	_ofs(output.empty()?"/dev/null":output.c_str())
 {
 	// empty
 }