Fix and test no-attribute disclosures

identifiers.go

@@ -111,6 +111,9 @@ func (id CredentialTypeIdentifier) IssuerIdentifier() IssuerIdentifier {
 
 // CredentialTypeIdentifier returns the CredentialTypeIdentifier of the attribute identifier.
 func (id AttributeTypeIdentifier) CredentialTypeIdentifier() CredentialTypeIdentifier {
+	if id.IsCredential() {
+		return NewCredentialTypeIdentifier(id.String())
+	}
 	return NewCredentialTypeIdentifier(id.Parent())
 }
 

irmaclient/session_test.go

@@ -211,6 +211,14 @@ func TestDisclosureSession(t *testing.T) {
 	sessionHelper(t, jwtcontents, "verification", nil)
 }
 
+func TestNoAttributeDisclosureSession(t *testing.T) {
+	id := irma.NewAttributeTypeIdentifier("irma-demo.RU.studentCard")
+	name := "testsp"
+
+	jwtcontents := getDisclosureJwt(name, id)
+	sessionHelper(t, jwtcontents, "verification", nil)
+}
+
 func TestIssuanceSession(t *testing.T) {
 	id := irma.NewAttributeTypeIdentifier("irma-demo.RU.studentCard.studentID")
 	name := "testip"