Update app.py

app.py

@@ -298,6 +298,7 @@ def get_chart(inp):
     return resp
 def summarize(inp,history,report_check,chart_check,data=None,files=None,url=None,pdf_url=None,pdf_batch=None):
     json_box=[]
+    error_box=""
     if inp == "":
         inp = "Process this data"
     history.clear()