Only raise symlink error if target exists

[jinmannwong]

Description

The changes merged in #30 raises an error when arch dir doesn't exist. This is a small fix to allow the target of the symlink not to exist.

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.66%. Comparing base (460350f) to head (9f9b1bc).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #35   +/-   ##
========================================
  Coverage    40.66%   40.66%           
========================================
  Files           48       48           
  Lines        10129    10129           
========================================
  Hits          4119     4119           
  Misses        6010     6010           

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[wdeconinck]

Makes sense, thanks for this!

[jinmannwong]

Would it be possible to have a new release with the recent changes?