Unrecognized functions in template cause "Template not found" error to display

Description
Unrecognized functions in template cause "Template not found" error to display

How to reproduce

1. Create a template with a function not recognized by Xporter
   e.g. ${timeformat("HH:mm:ss"):Created}
2. Try to upload that template to Xporter Cloud

Actual result/Attachments

Expected result
A more specific error message should appear

Version
Xporter Cloud - couldn't reproduce in DC