#159236214 Fix a redirect bug.

[ja-odur]

What does this PR do?

• Fixes a redirect bug

Description of Task to be completed?

• Fix the redirect bug that occurs due to the reference Gym id not being found in the database

How should this be manually tested?

• Clone this branch and follow the instructions stated in README to set up the application.
• After setting up the application, start the server by running the command python manage.py runserver in the terminal with your virtual environment set.
• In the browser, log in as an Admin and go to the gyms page. As an admin or a gym manager, you should be able to delete, deactivate and re-activate users as shown in the screenshots section.

Screenshots

[Yiga-fred]

@ja-odur the bug is fixed but the PR shows a lot of file changes, I suggest you only include what is related to the bug fix.

[Yiga-fred]

LGTM

[solnsubuga]

@ja-odur the commit message is misleading. Please use one that is descriptive of the bug you have fixed.

[ja-odur]

@solnsubuga @Yiga-fred I have worked on the comments you gave.

[coveralls]

Pull Request Test Coverage Report for Build 311

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 35 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.3%) to 92.952%

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Files with Coverage Reduction	New Missed Lines	%
wger/exercises/tests/test_categories.py	1	100.0%
wger/manager/views/set.py	1	96.33%
wger/manager/forms.py	2	100.0%
wger/exercises/tests/test_muscles.py	3	100.0%
wger/exercises/tests/test_equipment.py	3	100.0%
wger/exercises/tests/test_exercise.py	6	100.0%
wger/utils/widgets.py	19	97.4%

Totals
Change from base Build 309:	-0.3%
Covered Lines:	12265
Relevant Lines:	13195

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💛 - Coveralls

[solnsubuga]

LGTM