Resolved Null Crash and Improved Hint Behavior in SfTextInputLayout

[Choza-rajan]

Root Cause of the Issue

The issue occurs due to a lack of null checks in the InputView's TextChanged event.

Description of Change

• Added null checks for the Text property using the null conditional operator to prevent crashes when the text is set to null.
• Ensure that when the text is set to null or empty, the hint state is updated correctly by setting IsHintFloated to false.

Issues Fixed

Fixes #11

Screenshots

Before:

Before.mp4

After:

After.mp4

[PaulAndersonS]

/azp run

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