Version: 3.2.4, 3.3.0

Bug Description

When a file is not uploaded in a form, an empty FileUpload with uninitialized properties is returned to the Presenter. Once the data is processed by underlying code, by calling the __toString() method on the object, which is typed as returning string, it will, based on version, either end on null returned, expected string, or $tmpName must not be accessed before initialization

Expected Behavior

The method that should return a string returns a string.

Possible Solution

• Initialize the properties of FileUpload with values, namely $tmpName with empty string
  • Alternatively make the properties nullable and initialize with nulls
• Cast the $tmpName to string in the toString method so that no error is thrown.

Happy to prepare a PR once I know what the preferred solution is.