[Dropdown] option text is filled with value if empty

[lhns]

Bug Report

When I create a dropdown from a select, all options that had an empty text get the value as their text.
This was introduced in #1112:

- html +=   escape(option[fields.name],preserveHTML);
+ html +=   escape(option[fields.name] || option[fields.value],preserveHTML);

Is this behavour intentional? It doesn't happen on normal selects.

Steps to reproduce

1. Create a select:

<select class="ui search dropdown filter-dropdown">
  <option value="-1"></option>
  <option value="0">Item A</option>
  <option value="1">Item B</option>
  <option value="2">Item C</option>
</select>

2. Initialize dropdown:

$(".dropdown").dropdown();

Expected result

The first option is empty.

Screenshot

Actual result

The first option has "-1" as its text.

Screenshot

Testcase

https://jsfiddle.net/mons57e2/

Version

Since #1112

[lubber-de]

Fixed by #1209