Bug - LoginPage - Brand is always created even if optional attributes empty

[rebeccaalpert]

Describe the problem
brandImgSrc and brandImgAlt are marked as optional LoginPage props, but the Brand component gets created anyway: https://github.com/patternfly/patternfly-react/blob/main/packages/react-core/src/components/LoginPage/LoginPage.tsx#L68

Brent Dunn reported on PatternFly Slack that "An empty string ("") was passed to the src attribute" was being logged when these are omitted: https://codesandbox.io/p/devbox/dreamy-fog-qrqy95

How do you reproduce the problem?
https://codesandbox.io/p/devbox/dreamy-fog-qrqy95

Expected behavior
Optional props should optionally render component.

Is this issue blocking you?
Not urgent

What is your product and what release date are you targeting?
Not urgent

[github-actions]

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