TermInput: Terms added by separator have correct attributes

When the separator key is pressed after quoted string, the method
`onKeyDown()` calls `this.exchangeTerm()` which later calls `readFullTerm()`.
Here the string is still quoted add not trimed. But the attributes for label tag should
be unquoted and trimmed.

no matter added by separator or enter key

asset/js/widget/TermInput.js

@@ -45,9 +45,10 @@ define(["../notjQuery", "BaseInput"], function ($, BaseInput) {
         addTerm(termData, termIndex = null) {
             if (this.ignoreSpaceUntil !== null) {
                 if (this.ignoreSpaceSince === 0 && termData.label[this.ignoreSpaceSince] === this.ignoreSpaceUntil) {
-                    termData.label = termData.label.slice(1, -1);
+                    this.writePartialTerm(termData.label.slice(1, -1), this.input);
+                    termData = super.readFullTerm(this.input, termIndex);
 
-                    if (termData.label.length === 0) {
+                    if (! termData) {
                         return;
                     }
                 }