edje: fix an issue "description.text.text" is not shown

Summary:
"description.text.text" is not shown after applying a patch for
supporting text translation of Textblock part.
@fix T6997

Test Plan:
- Try to show a TEXTBLOCK part which has built-in text.
ex)
  textblock {
     scale;
     desc { "default";
        text {
           style: "my_style";
           text: "You can't see this text without this patch";
        }
     }
  }

Reviewers: Hermet, subodh6129, herdsman

Subscribers: cedric, #committers, zmike

Tags: #efl

Maniphest Tasks: T6997

Differential Revision: https://phab.enlightenment.org/D6257

src/lib/edje/edje_textblock.c

@@ -438,6 +438,7 @@ _edje_part_recalc_single_textblock(FLOAT_T sc,
         else
           {
              ep->typedata.text->text_source = NULL;
+             text = NULL;
              if (chosen_desc->text.domain)
                {
                   if (!chosen_desc->text.text.translated)