Slider: Pass 0 value if slider reaches it

[atomiomi]

If changed value is equal to zero then the last changed value is passed to ui object. This is due to checking in _uiHash method which defines whether the new value was passed or not.

Test link: https://jsfiddle.net/Lhqryk47/

1. Drag the handle on the right side
2. Value must be between 1 and 100
3. Now drag the handle on the minimum value (zero)
4. Passed value will be 1 or greater it depends on drag speed

[jzaefferer]

Please undo this indent change, on this line and the three above.

[atomiomi]

Indents are corrected.

[jzaefferer]

Looks good. I'll let @scottgonzalez review and merge.

[scottgonzalez]

Thanks. Filed the bug as http://bugs.jqueryui.com/ticket/12196, replaced typeof value !== "undefined" with value !== undefined for consistency, and merged into master.