Describe the bug
When no internet or the server is irresponsive, Document Embedding says "No internet connection."

To Reproduce
Steps to reproduce the behavior:

1. Turn off internet.
2. Place Document Embedding on the canvas.
3. Run it (connect to Corpus).

Expected behavior
Better error message, hopefully distinguishing between the two errors (no internet vs unresponsive server).

Orange version:
3.38.1

Text add-on version:
1.17