version 2.39.0

PIString works with PIConstChars
picodeinfo optimizations
PIIODevice::availableClasses

libs/main/io_devices/pifile.cpp

@@ -614,7 +614,7 @@ int PIFile::writeDevice(const void * data, int max_size) {
 
 
 PIFile &PIFile::operator <<(const PIString & v) {
-	if (canWrite() && PRIVATE->fd != 0)
+	if (canWrite() && v.isNotEmpty() && PRIVATE->fd != 0)
 		*this << v.toCharset(defaultCharset());
 	return *this;
 }