fix: allow clearing file upload settings (open-webui#22336)

Author: Algorithm5838

backend/open_webui/routers/retrieval.py

@@ -1055,26 +1055,10 @@ async def update_rag_config(
     )
 
     # File upload settings
-    request.app.state.config.FILE_MAX_SIZE = (
-        form_data.FILE_MAX_SIZE
-        if form_data.FILE_MAX_SIZE is not None
-        else request.app.state.config.FILE_MAX_SIZE
-    )
-    request.app.state.config.FILE_MAX_COUNT = (
-        form_data.FILE_MAX_COUNT
-        if form_data.FILE_MAX_COUNT is not None
-        else request.app.state.config.FILE_MAX_COUNT
-    )
-    request.app.state.config.FILE_IMAGE_COMPRESSION_WIDTH = (
-        form_data.FILE_IMAGE_COMPRESSION_WIDTH
-        if form_data.FILE_IMAGE_COMPRESSION_WIDTH is not None
-        else request.app.state.config.FILE_IMAGE_COMPRESSION_WIDTH
-    )
-    request.app.state.config.FILE_IMAGE_COMPRESSION_HEIGHT = (
-        form_data.FILE_IMAGE_COMPRESSION_HEIGHT
-        if form_data.FILE_IMAGE_COMPRESSION_HEIGHT is not None
-        else request.app.state.config.FILE_IMAGE_COMPRESSION_HEIGHT
-    )
+    request.app.state.config.FILE_MAX_SIZE = form_data.FILE_MAX_SIZE
+    request.app.state.config.FILE_MAX_COUNT = form_data.FILE_MAX_COUNT
+    request.app.state.config.FILE_IMAGE_COMPRESSION_WIDTH = form_data.FILE_IMAGE_COMPRESSION_WIDTH
+    request.app.state.config.FILE_IMAGE_COMPRESSION_HEIGHT = form_data.FILE_IMAGE_COMPRESSION_HEIGHT
     request.app.state.config.ALLOWED_FILE_EXTENSIONS = (
         form_data.ALLOWED_FILE_EXTENSIONS
         if form_data.ALLOWED_FILE_EXTENSIONS is not None