Revert "insert empty objects into config from empty blocks"

This reverts commit 3677522a28.
Later changes negate the need for this, and removing these again
prevents us from having to strip them back out when helper/schema
doesn't want them.

config/hcl2shim/values.go

@@ -80,6 +80,11 @@ func ConfigValueFromHCL2Block(v cty.Value, schema *configschema.Block) map[strin
 
 		case configschema.NestingList, configschema.NestingSet:
 			l := bv.LengthInt()
+			if l == 0 {
+				// skip empty collections to better mimic how HCL1 would behave
+				continue
+			}
+
 			elems := make([]interface{}, 0, l)
 			for it := bv.ElementIterator(); it.Next(); {
 				_, ev := it.Element()
@@ -92,6 +97,11 @@ func ConfigValueFromHCL2Block(v cty.Value, schema *configschema.Block) map[strin
 			ret[name] = elems
 
 		case configschema.NestingMap:
+			if bv.LengthInt() == 0 {
+				// skip empty collections to better mimic how HCL1 would behave
+				continue
+			}
+
 			elems := make(map[string]interface{})
 			for it := bv.ElementIterator(); it.Next(); {
 				ek, ev := it.Element()

config/hcl2shim/values_test.go

@@ -151,7 +151,7 @@ func TestConfigValueFromHCL2Block(t *testing.T) {
 		},
 		{
 			cty.ObjectVal(map[string]cty.Value{
-				"address": cty.ListValEmpty(cty.EmptyObject),
+				"address": cty.ListValEmpty(cty.EmptyObject), // should be omitted altogether in result
 			}),
 			&configschema.Block{
 				BlockTypes: map[string]*configschema.NestedBlock{
@@ -161,9 +161,7 @@ func TestConfigValueFromHCL2Block(t *testing.T) {
 					},
 				},
 			},
-			map[string]interface{}{
-				"address": []interface{}{},
-			},
+			map[string]interface{}{},
 		},
 		{
 			cty.ObjectVal(map[string]cty.Value{
@@ -195,9 +193,7 @@ func TestConfigValueFromHCL2Block(t *testing.T) {
 					},
 				},
 			},
-			map[string]interface{}{
-				"address": []interface{}{},
-			},
+			map[string]interface{}{},
 		},
 		{
 			cty.ObjectVal(map[string]cty.Value{
@@ -229,9 +225,7 @@ func TestConfigValueFromHCL2Block(t *testing.T) {
 					},
 				},
 			},
-			map[string]interface{}{
-				"address": map[string]interface{}{},
-			},
+			map[string]interface{}{},
 		},
 		{
 			cty.NullVal(cty.EmptyObject),
@@ -240,8 +234,8 @@ func TestConfigValueFromHCL2Block(t *testing.T) {
 		},
 	}
 
-	for i, test := range tests {
-		t.Run(fmt.Sprintf("%d-%#v", i, test.Input), func(t *testing.T) {
+	for _, test := range tests {
+		t.Run(fmt.Sprintf("%#v", test.Input), func(t *testing.T) {
 			got := ConfigValueFromHCL2Block(test.Input, test.Schema)
 			if !reflect.DeepEqual(got, test.Want) {
 				t.Errorf("wrong result\ninput: %#v\ngot:   %#v\nwant:  %#v", test.Input, got, test.Want)