entry: Don't unlink empty files when saving @fix T2122.

Simmple fix where we now only unlink if the object we are saving is NULL.
A null terminated string being null is not an error case.

legacy/elementary/src/lib/elm_entry.c

@@ -204,7 +204,7 @@ _utf8_markup_save(const char *file,
 {
    FILE *f;
 
-   if ((!text) || (!text[0]))
+   if (!text)
      {
         ecore_file_unlink(file);
         return;