Support missing variables at any depth

mustache.go

@@ -602,7 +602,9 @@ func renderSection(section *sectionElement, contextChain []interface{}, buf io.W
 	for _, ctx := range contexts {
 		chain2[0] = ctx
 		for _, elem := range section.elems {
-			renderElement(elem, chain2, buf)
+			if err := renderElement(elem, chain2, buf); err != nil {
+				return err
+			}
 		}
 	}
 	return nil

mustache_test.go

@@ -184,7 +184,6 @@ var tests = []Test{
 	{`"{{{person.name}}}" == "{{#person}}{{{name}}}{{/person}}"`, map[string]interface{}{"person": map[string]string{"name": "Joe"}}, `"Joe" == "Joe"`, nil},
 	{`"{{a.b.c.d.e.name}}" == "Phil"`, map[string]interface{}{"a": map[string]interface{}{"b": map[string]interface{}{"c": map[string]interface{}{"d": map[string]interface{}{"e": map[string]string{"name": "Phil"}}}}}}, `"Phil" == "Phil"`, nil},
 	{`"{{#a}}{{b.c.d.e.name}}{{/a}}" == "Phil"`, map[string]interface{}{"a": map[string]interface{}{"b": map[string]interface{}{"c": map[string]interface{}{"d": map[string]interface{}{"e": map[string]string{"name": "Phil"}}}}}, "b": map[string]interface{}{"c": map[string]interface{}{"d": map[string]interface{}{"e": map[string]string{"name": "Wrong"}}}}}, `"Phil" == "Phil"`, nil},
-	{`{{#a}}{{b.c}}{{/a}}`, map[string]interface{}{"a": map[string]interface{}{"b": map[string]string{}}, "b": map[string]string{"c": "ERROR"}}, "", nil},
 }
 
 func TestBasic(t *testing.T) {
@@ -219,6 +218,7 @@ var missing = []Test{
 	//dotted names(dot notation)
 	{`"{{a.b.c}}" == ""`, map[string]interface{}{}, `"" == ""`, nil},
 	{`"{{a.b.c.name}}" == ""`, map[string]interface{}{"a": map[string]interface{}{"b": map[string]string{}}, "c": map[string]string{"name": "Jim"}}, `"" == ""`, nil},
+	{`{{#a}}{{b.c}}{{/a}}`, map[string]interface{}{"a": map[string]interface{}{"b": map[string]string{}}, "b": map[string]string{"c": "ERROR"}}, "", nil},
 }
 
 func TestMissing(t *testing.T) {