compact code

app/util/validator.py

@@ -10,8 +10,7 @@ def validateInputData(inputFileDir: str) -> Error:
     if len(missing) > 0:
       description = 'You are missing the following: '
       for i in range(len(missing)):
-        if i != len(missing) - 1: description += f'{missing[i]}, '
-        else: description += f'{missing[i]}'
+        description += f'{missing[i]}, ' if i != len(missing) - 1 else description += f'{missing[i]}'
       missingErr = Error('Missing Required Fields', description)
 
       return missingErr