Fix: (org-ql-completing-read) Warn about empty headings

org-ql.info

@@ -1038,6 +1038,9 @@ File: README.info,  Node: 072-pre,  Next: 071,  Up: Changelog
      (https://github.com/alphapapa/org-ql/issues/351).  Thanks to Daniel
      Fleischer (https://github.com/danielfleischer) for reporting.)
    • Handle narrowed buffers correctly in ‘org-ql-find’.
+   • Warn about empty headings in ‘org-ql-completing-read’ (the Org
+     format allows a heading line to have no text, but it’s useless for
+     this purpose, and usually indicates unnoticed corruption).
 
 
 File: README.info,  Node: 071,  Next: 07,  Prev: 072-pre,  Up: Changelog
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