refactor: Fix issue with splitting similarity_doc_hash in get_similarity_doc function

src/controller/web.py

@@ -260,8 +260,9 @@ def re_generate(chat_request: ReGenerateRequest, token: str = Header(None)):
     }
 
 def get_similarity_doc(similarity_doc_hash: str):
-    hashs = similarity_doc_hash.split(",")
-    if len(hashs) == 0:
+    if hashs:
+        hashs = similarity_doc_hash.split(",")
+    if not hashs or len(hashs) == 0:
         return []
     docs = []
     txt_doc = TxtDoc(k_db)