Update app.py

app.py

@@ -493,9 +493,12 @@ def main(api,api_base, paper_pdf, aspect, model_name, limit_num, enable_rag):
     comments = ''
     output2 = ''
     retrieved_content = ''
-    if not api or not paper_pdf:
-        comments =  "It looks like there's a missing API key or PDF input. Make sure you've provided the necessary information or uploaded the required file."
+    if not api or not paper_pdf or not api_base:
+        comments =  "It looks like there's a missing API key/base URL or PDF input. Make sure you've provided the necessary information or uploaded the required file."
         output2 =  "It looks like there's a missing API key or PDF input. Make sure you've provided the necessary information or uploaded the required file."
+    if not limit_num.isdigit() or int(limit_num) <= 0:
+        comments =  "The input number is not a positive integer."
+        output2 =  "The input number is not a positive integer."
     else:
         try:
             reviewer1 = Reviewer(api,api_base, paper_pdf, aspect, model_name, limit_num, enable_rag)