Fix: rank feat issue. (#6225)

### What problem does this PR solve?


### Type of change

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

rag/nlp/search.py

@@ -259,6 +259,7 @@ class Dealer:
         for i in search_res.ids:
             nor, denor = 0, 0
             if not search_res.field[i].get(TAG_FLD):
+                rank_fea.append(0)
                 continue
             for t, sc in eval(search_res.field[i].get(TAG_FLD, "{}")).items():
                 if t in query_rfea:

rag/utils/__init__.py

@@ -100,7 +100,7 @@ def clean_markdown_block(text):
     return text.strip()
 
   
-def get_float(v: str | None):
+def get_float(v: str | int | float | None):
     if v is None:
         return float('-inf')
     try: