fix null tags

Author: Emyrk

cli/clidisplay/resources.go

@@ -23,7 +23,7 @@ func WorkspaceTags(writer io.Writer, tags types.TagBlocks) hcl.Diagnostics {
 	tableWriter.AppendHeader(row)
 	for _, tb := range tags {
 		for _, tag := range tb.Tags {
-			if tag.IsKnown() {
+			if tag.Valid() {
 				k, v := tag.AsStrings()
 				tableWriter.AppendRow(table.Row{k, v, ""})
 				continue

preview_test.go

@@ -163,6 +163,16 @@ func Test_Extract(t *testing.T) {
 			expUnknowns: []string{},
 			params:      map[string]func(t *testing.T, parameter types.Parameter){},
 		},
+		{
+			name:    "null default",
+			dir:     "nulldefault",
+			expTags: map[string]string{},
+			input: preview.Input{
+				ParameterValues: map[string]types.ParameterValue{},
+			},
+			expUnknowns: []string{},
+			params:      map[string]func(t *testing.T, parameter types.Parameter){},
+		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()

testdata/nulldefault/main.tf

@@ -84,6 +84,9 @@ func (t Tag) Valid() bool {
 	if !t.Key.Type().Equals(cty.String) || !t.Value.Type().Equals(cty.String) {
 		return false
 	}
+	if t.Key.IsNull() || t.Value.IsNull() {
+		return false
+	}
 	return true
 }