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• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
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• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

When using <Image [tintColor]="null" ... a throwable will occur:

java.lang.Throwable
Cannot read properties of null (reading 'android')
.[tintColor:setNative] (vendor.js)
.Style.<anonymous> (vendor.js)
.set tintColor [as tintColor] (vendor.js)
.ViewUtil.setPropertyInternal (vendor.js)
.ViewUtil.setProperty (vendor.js)
.EmulatedRenderer.setProperty (vendor.js)

What is the new behavior?

Image tintColor now handles null and undefined properly.

closes #10515