Fix infinite loop in decodeMap

decoder.go

@@ -199,6 +199,7 @@ func (d *decoder) decodeMap(name string, o *hcl.Object, result reflect.Value) er
 	current := o
 	for current != nil {
 		if current.Value == nil {
+			current = current.Next
 			continue
 		}
 

decoder_test.go

@@ -20,6 +20,17 @@ func TestDecode_interface(t *testing.T) {
 				"foo": "bar",
 			},
 		},
+		{
+			"empty.hcl",
+			false,
+			map[string]interface{}{
+				"resource": map[string]interface{}{
+					"aws_instance": map[string]interface{}{
+						"db": map[string]interface{}{},
+					},
+				},
+			},
+		},
 		/*
 			{
 				"structure.hcl",

test-fixtures/empty.hcl

@@ -0,0 +1 @@
+resource "aws_instance" "db" {}