fix: Show correct length in TableStyle warning

Author: DenverCoder1

Diff for: table2ascii/table_style.py

@@ -128,8 +128,8 @@ def from_string(cls, string: str) -> "TableStyle":
             raise TableStyleTooLongError(string, num_params)
         # if the string is too short, show a warning and pad it with spaces
         elif len(string) < num_params:
-            string += " " * (num_params - len(string))
             warnings.warn(TableStyleTooShortWarning(string, num_params), stacklevel=2)
+            string += " " * (num_params - len(string))
         return cls(*string)
 
     def set(self, **kwargs) -> "TableStyle":