Bug related to show_progress argument in compute_totals

[JustinSGray]

Summary of Issue

the wrong kind of attribute is being written to in some case

Issue Type

• Bug
• Enhancement
  POEM #___ <N/A or POEM number at https://github.com/OpenMDAO/POEMs>

Description

Bug reported by user when they had show_progress turned on:

p.check_totals(wrt=['traj.ballistic.states:omega'],show_progress=True)
  File "/home/jsgray/git/OpenMDAO/openmdao/core/problem.py", line 1527, in check_totals
    Jfd = total_info.compute_totals_approx(initialize=True, progress_out_stream=out_stream)
  File "/home/jsgray/git/OpenMDAO/openmdao/core/total_jac.py", line 1499, in compute_totals_approx
    sub_do_ln=model._linear_solver._linearize_children())
  File "/home/jsgray/git/OpenMDAO/openmdao/core/group.py", line 2533, in _linearize
    approximation.compute_approximations(self, jac=jac, total=True)
  File "/home/jsgray/git/OpenMDAO/openmdao/approximation_schemes/finite_difference.py", line 198, in compute_approximations
    self._compute_approximations(system, jac, total, system._outputs._under_complex_step)
  File "/home/jsgray/git/OpenMDAO/openmdao/approximation_schemes/approximation_scheme.py", line 407, in _compute_approximations
    self._progress_out.write(f"{fd_count+1}/{len(full_idxs)}: Checking "
AttributeError: '_ReprClass' object has no attribute 'write'

Example

User couldn't provide example case. We'll have to work it out from the error msg