PR: Fix test_leaks on master

[impact27]

Description of Changes

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

Issue(s) Resolved

Fixes #

Affirmation

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I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

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[pep8speaks]

Hello @impact27! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file spyder/app/tests/test_mainwindow.py:

Line 550:1: W293 blank line contains whitespace
Line 565:1: W293 blank line contains whitespace
Line 573:1: W293 blank line contains whitespace
Line 579:1: W293 blank line contains whitespace

[ccordoba12]

Thanks @impact27!