Fix invite flow.

Signal/src/ViewControllers/InviteFlow.swift

@@ -129,7 +129,9 @@ class InviteFlow: NSObject, MFMessageComposeViewControllerDelegate, MFMailCompos
 
     func contactsPicker(_: ContactsPicker, contactFetchDidFail error: NSError) {
         Logger.error("\(self.logTag) in \(#function) with error: \(error)")
-        self.presentingViewController.dismiss(animated: true)
+        self.presentingViewController.dismiss(animated: true) {
+            OWSAlerts.showErrorAlert(message: NSLocalizedString("ERROR_COULD_NOT_FETCH_CONTACTS", comment: "Error indicating that the phone's contacts could not be retrieved."))
+        }
     }
 
     func contactsPickerDidCancel(_: ContactsPicker) {

Signal/translations/en.lproj/Localizable.strings

@@ -797,6 +797,9 @@
 /* Call setup status label */
 "END_CALL_UNCATEGORIZED_FAILURE" = "Call Failed.";
 
+/* Error indicating that the phone's contacts could not be retrieved. */
+"ERROR_COULD_NOT_FETCH_CONTACTS" = "Could not access contacts.";
+
 /* Generic notice when message failed to send. */
 "ERROR_DESCRIPTION_CLIENT_SENDING_FAILURE" = "Failed to send message.";