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Viewing a dataframe after installing pandas crashes

See original GitHub issue

Description

What steps will reproduce the problem?

Install Spyder, don’t install pandas.
Go to view a pandas dataframe (e.g. if your project python executable is in a venv)
Get an error that pandas isn’t installed.
Realize you haven’t got pandas installed globally alongside Spyder, so install it with pip.
Go to view the pandas dataframe again.
See this crash.

Traceback

  File "/home/jarrad/.local/lib/python3.7/site-packages/spyder/plugins/variableexplorer/widgets/objectexplorer/tree_model.py", line 267, in fetchMore
    parent_item.obj_path)
  File "/home/jarrad/.local/lib/python3.7/site-packages/spyder/plugins/variableexplorer/widgets/objectexplorer/tree_model.py", line 322, in _fetchObjectChildren
    for attr_name, attr_value in sorted(inspect.getmembers(obj)):
  File "/usr/lib/python3.7/inspect.py", line 341, in getmembers
    value = getattr(object, key)
  File "/home/jarrad/.local/lib/python3.7/site-packages/pandas/core/frame.py", line 391, in _constructor_expanddim
    raise NotImplementedError("Not supported for DataFrames!")
NotImplementedError: Not supported for DataFrames!
Traceback (most recent call last):
  File "/home/jarrad/.local/lib/python3.7/site-packages/spyder/plugins/variableexplorer/widgets/objectexplorer/tree_model.py", line 267, in fetchMore
    parent_item.obj_path)
  File "/home/jarrad/.local/lib/python3.7/site-packages/spyder/plugins/variableexplorer/widgets/objectexplorer/tree_model.py", line 322, in _fetchObjectChildren
    for attr_name, attr_value in sorted(inspect.getmembers(obj)):
  File "/usr/lib/python3.7/inspect.py", line 341, in getmembers
    value = getattr(object, key)
  File "/home/jarrad/.local/lib/python3.7/site-packages/pandas/core/frame.py", line 391, in _constructor_expanddim
    raise NotImplementedError("Not supported for DataFrames!")
NotImplementedError: Not supported for DataFrames!

Versions

Spyder version: 4.0.0b4
Python version: 3.7.3
Qt version: 5.12.2
PyQt5 version: 5.12.1
Operating System: Linux 5.0.0-20-generic

Dependencies

pygments >=2.0    :  2.3.1 (OK)
qdarkstyle >=2.6.4:  2.7 (OK)
sphinx >=0.6.6    :  2.1.2 (OK)
psutil >=0.3      :  5.5.1 (OK)
pyls >=0.27.0     :  v0.28.1 (OK)
nbconvert >=4.0   :  5.4.0 (OK)
pandas >=0.13.1   :  None (OK)
numpy >=1.7       :  1.16.2 (OK)
sympy >=0.7.3     :  None (NOK)
cython >=0.21     :  None (NOK)
qtconsole >=4.5.2 :  4.5.2 (OK)
IPython >=4.0     :  5.8.0 (OK)
matplotlib >=2.0.0:  3.0.2 (OK)
pylint >=0.25     :  2.2.2 (OK)