Fix: no chunks parsed out for Law (#8842)

### What problem does this PR solve?

Fixes no chunks parsed out for Law. #5113 

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/nlp/__init__.py

     hits = [0] * len(BULLET_PATTERN)
     for i, pro in enumerate(BULLET_PATTERN):
         for sec in sections:
+            sec = sec.strip()
             for p in pro:
                 if re.match(p, sec) and not not_bullet(sec):
                     hits[i] += 1