Update app.py

app.py

@@ -23,7 +23,7 @@ xlrd .xlsx .ensure_elementtree_imported (False ,None )#line:25
 xlrd .xlsx .Element_has_iter =True #line:26
 
 def remove_non_printable(value):
-    #if isinstance(value, str):
+    if isinstance(value, str):
         #return re.sub(r'[^\x20-\x7E\n\t\xa0]|(?<=\w)\n|(?<=\w)\t', '', value)
         #return re.sub(r'[\x00-\x1F\x7F-\x9F\xa0\n\t\s]+|(?<=\w)\\n|(?<=\w)\\xa0(?<=\w)\\n|(?<=\w)\\t', ' ', value)
         value = re.sub(r'\s*[\n\t\xa0]+\s*', ' ', value)