Unable to use paper-input with v3.2.0

[hitesh153]

Description

1. The Overlay for date-picker does not open when we are using the tag v3.2.0
2. Throws a console error from paper-input-behavior, which is coming due to the updates in the following commit tag

On further inspection we have found that the function added to validate the inputValue at line #437 is sending an empty inputValue and hence Overlay is unable to be shown

Expected outcome

On click on input field the overlay should pop up and allow user to select a date from inside it

Actual outcome

Overlay does not show up and user is unable to make any input in the date picker.

Demo

vaadin-date-picker-light attr-for-value="value"> <paper-input></paper-input> </vaadin-date-picker-light>

Steps to reproduce

1. Put a vaadin-date-picker element in the page.
2. Add the paper-input for the input field as shown in the demo
3. Click the input field from the date-picker

[hitesh153]

Update: We are able to make it work on tag v3.1.2

[limonte]

Unable to reproduce the issue: https://glitch.com/edit/#!/bristle-wool?path=bower.json:8:3

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