Ignore empty lines inside the BIO files

nerval/parse.py

@@ -108,7 +108,7 @@ def parse_bio(lines: List[str]) -> dict:
                     and get_type_label(future_label) != last_tag
                 ):
                     index += 1
-                    if index < len(lines):
+                    if index < len(lines) and lines[index]:
                         future_label = lines[index].split()[1]
 
                 # Check for continuation of the original entity

tests/fixtures/end_of_file.bio

@@ -6,6 +6,7 @@ de I-PER
 Dieu I-PER
 roy I-PER
 de I-PER
+
 France B-LOC
 et I-PER
 de I-PER