Catch error in call to data sources, output format selection tool AI

Previously if the call to this tool AI failed, the API call would
non-gracefully fail on server. This would leave the client hanging in
a wierd state (e.g with spinner running on web app with no indication
of issue).

Also do not show filters in query debug log lines when no filters in query

src/khoj/routers/api.py

@@ -392,7 +392,8 @@ async def extract_references_and_questions(
 
     filters_in_query += " ".join([f'file:"{filter}"' for filter in conversation.file_filters])
     using_offline_chat = False
-    logger.debug(f"Filters in query: {filters_in_query}")
+    if is_none_or_empty(filters_in_query):
+        logger.debug(f"Filters in query: {filters_in_query}")
 
     personality_context = prompts.personality_context.format(personality=agent.personality) if agent else ""
 

src/khoj/routers/api_chat.py

@@ -785,16 +785,21 @@ async def chat(
         program_execution_context: List[str] = []
 
         if conversation_commands == [ConversationCommand.Default]:
-            chosen_io = await aget_data_sources_and_output_format(
-                q,
-                meta_log,
-                is_automated_task,
-                user=user,
-                query_images=uploaded_images,
-                agent=agent,
-                query_files=attached_file_context,
-                tracer=tracer,
-            )
+            try:
+                chosen_io = await aget_data_sources_and_output_format(
+                    q,
+                    meta_log,
+                    is_automated_task,
+                    user=user,
+                    query_images=uploaded_images,
+                    agent=agent,
+                    query_files=attached_file_context,
+                    tracer=tracer,
+                )
+            except ValueError as e:
+                logger.error(f"Error getting data sources and output format: {e}. Falling back to default.")
+                conversation_commands = [ConversationCommand.General]
+
             conversation_commands = chosen_io.get("sources") + [chosen_io.get("output")]
 
             # If we're doing research, we don't want to do anything else