ifcfg-rh: accept 802.1x connection with empty EAP-TLS identity

An identity is not needed for EAP-TLS.

https://bugzilla.redhat.com/show_bug.cgi?id=1391477

src/settings/plugins/ifcfg-rh/nms-ifcfg-rh-reader.c

@@ -2550,14 +2550,10 @@ eap_tls_reader (const char *eap_method,
 	NMSettingSecretFlags flags;
 
 	value = svGetValueString (ifcfg, "IEEE_8021X_IDENTITY");
-	if (!value) {
-		g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_INVALID_CONNECTION,
-		             "Missing IEEE_8021X_IDENTITY for EAP method '%s'.",
-		             eap_method);
-		return FALSE;
-	}
+	if (value) {
 		g_object_set (s_8021x, NM_SETTING_802_1X_IDENTITY, value, NULL);
 		g_free (value);
+	}
 
 	ca_cert = svGetValueString (ifcfg, ca_cert_key);
 	if (ca_cert) {