Update app.py

app.py

@@ -171,6 +171,10 @@ def create_pdf_report_with_viz(report, conclusion, visualizations):
 
 
 def escape_markdown(text):
+    # Ensure the input is a string
+    if not isinstance(text, str):
+        text = str(text) if text is not None else ""
+    
     # Escape special markdown characters
     escape_chars = r"\*`_{}[]()#+-.!"
     return re.sub(f'([{re.escape(escape_chars)}])', r'\\\1', text)