Revert semantic change in previous revision.

emitterc.go

diff --git a/emitterc.go b/emitterc.go
index 8fe2363..49c7f46 100644
--- a/emitterc.go
+++ b/emitterc.go
@@ -1012,7 +1012,7 @@
 		return true
 	}
 
-	if len(value) == 3 && ((value[0] == '-' && value[1] == '-' && value[2] == '-') || (value[0] == '.' && value[1] == '.' && value[2] == '.')) {
+	if len(value) >= 3 && ((value[0] == '-' && value[1] == '-' && value[2] == '-') || (value[0] == '.' && value[1] == '.' && value[2] == '.')) {
 		block_indicators = true
 		flow_indicators = true
 	}