Fixes installation using wget

[tickelton]

Fixes an issue where during installation using wget an
uninitialized variable was read which caused the process to
get stuck.

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?
  Bug fix

• What is the current behavior?
  When installing using wget the process gets stuck because output is redirected
  incorrectly and an initialized variable is read.

• What is the new behavior?
  Installation using wget now works properly.

• Does this PR introduce a breaking change, and is
  titled accordingly?
  Does not introduce a breaking change.

• Other information:

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[silvanocerza]

Nice catch, thank you for your contribution. 🙏