Catch exceptional situation.

The simple 'return None' does not suit the assignment to the complex
'(part, section, line_number), tex_line' and raises a 'TypeError'
exception.

git-svn-id: svn://tug.org/texlive/trunk@71596 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 3 insertions, 2 deletions

diff --git a/Build/source/texk/web2c/tests/fix-changefile-lines.py b/Build/source/texk/web2c/tests/fix-changefile-lines.py
index 7efcdf3146a..0ff5ca6d7d2 100755
--- a/Build/source/texk/web2c/tests/fix-changefile-lines.py
+++ b/Build/source/texk/web2c/tests/fix-changefile-lines.py
@@ -146,8 +146,9 @@ class ChangeReader:
         as well as the line number of the first match line in the WEB file.
         """
         while True:
-            (part, section, line_number), tex_line = web_reader.next_line()
-            if tex_line is None:
+            try:
+                (part, section, line_number), tex_line = web_reader.next_line()
+            except:
                 eprint("ERROR: Could not find match for line:")
                 eprint(f"  {self._match_lines[0]}")
                 sys.exit(1)