unknown author and shiftChords

chord_settings.ly

@@ -32,6 +32,12 @@ shiftChord = #(define-music-function (parser location xshift chord) (number? ly:
 	$chord
 #})
 
+shiftChords = #(define-music-function (parser location xshift chords) (number? ly:music?)
+#{
+	\override ChordName.extra-offset = #`(,xshift . 0)
+	$chords
+#})
+
 % kleine Mollakkorde und Alteration ausgeschrieben
 #(define (note-name->german-markup-nosym pitch lowercase?)
    (define (pitch-alteration-semitones pitch) (inexact->exact (round (* (ly:pitch-alteration pitch) 2))))

footer_with_songinfo.ly

@@ -16,7 +16,7 @@
           (assoc-ref author "death_year")
           (assoc-ref author "organization")
         )
-        (ly:warning (ly:format "author with id ~a not found" authorId)))))
+        "unbekannt")))
 
   (define (format-poet poetId)
     (string-append (ly:output-def-lookup layout 'poetPrefix) " " (format-author poetId #f)))