Gracefully skip indexing when empty list of docs provided

Improve error message when fail to index content

src/khoj/processor/embeddings.py

@@ -86,7 +86,7 @@ def embed_documents(self, docs):
                     embeddings += generated_embeddings
                     pbar.update(1000)
             return embeddings
-        return self.embeddings_model.encode(docs, **self.docs_encode_kwargs).tolist()
+        return self.embeddings_model.encode(docs, **self.docs_encode_kwargs).tolist() if docs else []
 
 
 class CrossEncoderModel:

src/khoj/routers/indexer.py

@@ -119,7 +119,7 @@ async def update(
     except Exception as e:
         logger.error(f"Failed to process batch indexing request: {e}", exc_info=True)
         logger.error(
-            f"🚨 Failed to {force} update {t} content index triggered via API call by {client} client: {e}",
+            f'🚨 Failed to {"force " if force else ""}update {t} content index triggered via API call by {client} client: {e}',
             exc_info=True,
         )
         return Response(content="Failed", status_code=500)