BUG: Default value "This window" for link's property "Target" is not shown in selectbox

[fedulovivan]

Steps:

• Open fiddle https://jsfiddle.net/x2g03d58/ with simple markup <a id="ic72">Link</a><a target="_blank" id="is3u">Link</a>
• Select first link (which doesn't have target attribute) on canvas.
• Open Component Settings panel
• Check the value of "Target" attribute

Expected result:

• Value "This window" is shown

Actual result:

• Empty value is shown

Additional thing is observed on newsletter demo (with storage manager enabled):
User can select "This window" value explicitly. This still leaves anchor tag without target attribute in markup, but after page refresh selected value 'This window" remains selected in Component settings.

Environment:
macos 10.14.5, chrome 83.0