Improve error handling - check API key before client init

main.py

@@ -152,14 +152,21 @@ async def process_query(request: QueryRequest):
     session_id = request.session_id or "demo-session"
     
     # Check if Groq is available
-    if not groq_client:
+    # Check if Groq API key is configured
+    if not GROQ_API_KEY:
         return QueryResponse(
             success=False,
             error="GROQ_API_KEY not configured. Please add it in HF Spaces Settings > Variables.",
             session_id=session_id
         )
     
-    try:
+    # Check if Groq client initialized successfully
+    if not groq_client:
+        return QueryResponse(
+            success=False,
+            error="Groq client initialization failed. Running in limited mode.",
+            session_id=session_id
+        )try:
         # Generate SQL using Groq
         sql, error = generate_sql_with_groq(request.question)