yang printer: NEW: container presence
diff --git a/src/printer/yang.c b/src/printer/yang.c
index 8bebbfa..ee2ae3d 100644
--- a/src/printer/yang.c
+++ b/src/printer/yang.c
@@ -268,6 +268,9 @@
 	fprintf(f, "%*scontainer %s {\n", LEVEL, INDENT, mnode->name);
 
 	level++;
+	if (cont->presence != NULL) {
+		yang_print_text(f, level, "presence", cont->presence);
+	}
 
 	for (i = 0; i < cont->must_size; i++) {
 		yang_print_must(f, level, &cont->must[i]);