Imported trailing newlines cause IndexError

[rhartmann]

Suppose you have the following test file with at least two trailing newlines:

# Blame

Test

Import that into the repository by commiting it on the CLI or pulling it from somewhere.

You can view the resulting page, but when trying to show its blame, you get:

  File "/opt/venv/lib/python3.12/site-packages/otterwiki/wiki.py", line 742, in blame
    line = markup_lines[int(row[3]) - 1]
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
IndexError: list index out of range

Wrapping line 742 into try/except like this seems to fix it:

try:
  line = markup_lines[int(row[3]) - 1]
except IndexError as e:
  line = ""

Admittedly, it's a corner case. It does not happen when saving the page from within the wiki where trailing newlines are truncated to a single newline.