refac: env var defaults

backend/open_webui/config.py

@@ -1067,11 +1067,11 @@ RAG_EMBEDDING_MODEL = PersistentConfig(
 log.info(f"Embedding model set: {RAG_EMBEDDING_MODEL.value}")
 
 RAG_EMBEDDING_MODEL_AUTO_UPDATE = (
-    os.environ.get("RAG_EMBEDDING_MODEL_AUTO_UPDATE", "").lower() == "true"
+    os.environ.get("RAG_EMBEDDING_MODEL_AUTO_UPDATE", "True").lower() == "true"
 )
 
 RAG_EMBEDDING_MODEL_TRUST_REMOTE_CODE = (
-    os.environ.get("RAG_EMBEDDING_MODEL_TRUST_REMOTE_CODE", "").lower() == "true"
+    os.environ.get("RAG_EMBEDDING_MODEL_TRUST_REMOTE_CODE", "True").lower() == "true"
 )
 
 RAG_EMBEDDING_BATCH_SIZE = PersistentConfig(
@@ -1092,11 +1092,11 @@ if RAG_RERANKING_MODEL.value != "":
     log.info(f"Reranking model set: {RAG_RERANKING_MODEL.value}")
 
 RAG_RERANKING_MODEL_AUTO_UPDATE = (
-    os.environ.get("RAG_RERANKING_MODEL_AUTO_UPDATE", "").lower() == "true"
+    os.environ.get("RAG_RERANKING_MODEL_AUTO_UPDATE", "True").lower() == "true"
 )
 
 RAG_RERANKING_MODEL_TRUST_REMOTE_CODE = (
-    os.environ.get("RAG_RERANKING_MODEL_TRUST_REMOTE_CODE", "").lower() == "true"
+    os.environ.get("RAG_RERANKING_MODEL_TRUST_REMOTE_CODE", "True").lower() == "true"
 )