Explicitly unwrap UIScreen.main before accesing its scale property

[rikner]

Type of change:

Motivation (current vs expected behavior)

Since UIScreen.main is an implicitly unwrapped optional, it would be safer to check it for nil before using its scale property.

Please check if the PR fulfills these requirements

• [ ] Self-review: I am confident this is the simplest and clearest way to achieve the expected behaviour
• [ ] There are no dependencies on other PRs or I have linked dependencies through Zenhub
• [ ] The commit messages are clean and understandable
• [ ] Tests for the changes have been added (for bug fixes / features)

[codecov[bot]]

Codecov Report

Merging #321 (87c5df6) into master (0e44ce4) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #321      +/-   ##
==========================================
+ Coverage   51.42%   51.44%   +0.01%     
==========================================
  Files          87       87              
  Lines        2872     2873       +1     
==========================================
+ Hits         1477     1478       +1     
  Misses       1395     1395              

Impacted Files	Coverage Δ
Sources/UIView.swift	90.42% <100.00%> (+0.05%)	:arrow_up:

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