add no-arg alias from RETR to LIST

src/plugins/filer_local/filer_local.cpp

@@ -262,6 +262,10 @@ public:
 				return fd;
 			}
 			
+			if (fs::is_directory(resolved)) {
+				return list(std::string(fd.relpath));
+			}
+			
 			if (type != 'A') {
 				// Create a shared_ptr to manage the ifstream
 				fd.stream = std::make_shared<std::ifstream>(resolved, std::ios::in|std::ios::binary);