No notification message appears after deleting date in Start time box on 'Manage Access Policies' dialog

[v-xianya]

Storage Explorer Version: 1.14.0-dev
Build: 20200521.3
Branch: master
Platform/OS: Windows 10/ Linux Ubuntu 16.04/ macOS Mojave
Architecture: ia32/x64
Regression From: Previous release (1.13.0)

Steps to reproduce:

1. Expand one storage account -> Blob Containers.
2. Select one blob container and open its context menu -> Click 'Manage Access Policies...'.
3. Click 'Add' -> Delete one date value in Start time box then hover over on it.
4. Check whether there appears a notification message or not.

Expect Experience:
A notification message appears.

Actual Experience:
No notification message appears.

More Info:
This issue also reproduces for one file share/ table.

[JasonYeMSFT]

The has been a Chromium behavior change introduced since Electron 5.0.0. When a title="" (tooltip) is provided to to the input element, the element will privilege the tooltip instead of showing a built-in error message.

Incomplete date time value is equivalent to empty date time. For us, this is by design since we now allow the start/expiry time to be empty because of #764. So we won't add an error message to this input element because the value is valid to be empty.