replace == None with is None

backend/apps/rag/main.py

@@ -1185,7 +1185,7 @@ def store_doc(
             f.close()
 
         f = open(file_path, "rb")
-        if collection_name == None:
+        if collection_name is None:
             collection_name = calculate_sha256(f)[:63]
         f.close()
 
@@ -1238,7 +1238,7 @@ def process_doc(
         f = open(file_path, "rb")
 
         collection_name = form_data.collection_name
-        if collection_name == None:
+        if collection_name is None:
             collection_name = calculate_sha256(f)[:63]
         f.close()
 
@@ -1296,7 +1296,7 @@ def store_text(
 ):
 
     collection_name = form_data.collection_name
-    if collection_name == None:
+    if collection_name is None:
         collection_name = calculate_sha256_string(form_data.content)
 
     result = store_text_in_vector_db(
@@ -1339,7 +1339,7 @@ def scan_docs_dir(user=Depends(get_admin_user)):
                         sanitized_filename = sanitize_filename(filename)
                         doc = Documents.get_doc_by_name(sanitized_filename)
 
-                        if doc == None:
+                        if doc is None:
                             doc = Documents.insert_new_doc(
                                 user.id,
                                 DocumentForm(