Creator does not suggest location for empty file when in Disassembler

1. Open a project.
2. In the project, set a breakpoint.
3. Let the project run up to the breakpoint.
4. Switch to instruction wise operation mode.
5. Select "File" -> "New File or Project..." -> "General" -> "Empty File" from the menu and the dialog.
   The "Path" edit for the file will be empty.

Creator should use a sensible default for this, e.g. the user's home directory.