[generate_card.py] assert against useless use of lists

1 files changed, 2 insertions, 0 deletions

diff --git a/scripts/generate_card.py b/scripts/generate_card.py
index adee5693..8e8f0aa6 100755
--- a/scripts/generate_card.py
+++ b/scripts/generate_card.py
@@ -114,6 +114,7 @@ def get_latex_field(card: MutableMapping,
     # Transform a list of values into a single string.
     # normal fields are joined using '\\ '
     if not has_latex:
+        assert len(normal_value) > 1
         return '\\\\ '.join(normal_value), False
 
     # latex_* values are just concatenated.
@@ -121,6 +122,7 @@ def get_latex_field(card: MutableMapping,
     # NOTE: it is allowed for a latex_ field to be sparse.
     # Missing entries in a latex_ field list are populated from the corrsponding
     # entry of the normal field
+    assert len(latex_value) > 1
     for i in range(0, len(latex_value)):
         if latex_value[i] is None:
             latex_value[i] = f'{fmt_prefix}{normal_value[i]}// '