Do not call get_components in is_stored

[dachengx]

What is the problem / what does the code in this PR do

Further simplify #796. Because get_components will call the initialization of FileSaver, which will try to make and delete _temp folders.

See slack thread.

Can you briefly describe how it works?

Can you give a minimal working example (or illustrate with a figure)?

Please include the following if applicable:

• Update the docstring(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Please make sure that all automated tests have passed before asking for a review (you can save the PR as a draft otherwise).

[coveralls]

coverage: 91.475% (-0.08%) from 91.557%
when pulling 6d4223d on no_default_detail_is_stored
into 243eb2b on master.