Handle missing Blablador key

app.py

@@ -822,9 +822,10 @@ async def generate_response(prompt: str, max_new_tokens: int = MAX_NEW_TOKENS) -
     
     url = f"{REMOTE_API_BASE}/completions"
     headers = {
-        "Content-Type": "application/json",
-        "Authorization": f"Bearer {BLABLADOR_API_KEY}"
+        "Content-Type": "application/json"
     }
+    if BLABLADOR_API_KEY:
+        headers["Authorization"] = f"Bearer {BLABLADOR_API_KEY}"
     payload = {
         "model": selected_model,
         "prompt": prompt,
@@ -857,6 +858,13 @@ async def run_agent_streaming(
         yield "<p style='color: var(--body-text-color-subdued); text-align: center; padding: 2rem;'>Please enter a question to begin.</p>"
         return
 
+    if not BLABLADOR_API_KEY:
+        yield """<div class="error-message">
+            <p><strong>BLABLADOR_API_KEY Missing</strong></p>
+            <p>The Blablador API Key is not configured in the Space secrets. Please add it to your Space settings.</p>
+        </div>"""
+        return
+
     # Load tokenizer for prompt formatting
     try:
         load_tokenizer()