Update app.py

app.py

@@ -14,8 +14,18 @@ DEFAULT_MSG = "How can I help you today?"
 def read_pdf(file):
     if file is None:
         return ""
-    path = file.name if hasattr(file, "name") else file
+
+    # HF sends dict: {'name':..., 'path':...}
+    if isinstance(file, dict):
+        path = file.get("path")
+    else:
+        path = getattr(file, "name", file)
+
     reader = PdfReader(path)
+    text = ""
+    for page in reader.pages:
+        text += page.extract_text() or ""
+    return text
 
 def ask_ai(prompt):
     res = client.chat.completions.create(
@@ -43,6 +53,11 @@ def app(text, pdf, mode):
     if pdf is not None:
         text = read_pdf(pdf)
 
+    if not text.strip():
+        return DEFAULT_MSG
+
+    return router(text, mode)
+
 custom_css = """
 /* FORCE OVERRIDE HF THEME */
 .gradio-container * { box-sizing: border-box; }