Only clearpage and flush \pgfutil@everybye if non-empty #724

Author: hmenke

tex/generic/pgf/utilities/pgfutil-latex.def

@@ -90,7 +90,10 @@
 
 \def\pgfutil@check@rerun#1#2{\@newl@bel{pgf@lab}{#1}{#2}}
 
-\AtBeginDocument{\AtEndDocument{\clearpage\the\pgfutil@everybye}}
+\AtBeginDocument{\AtEndDocument{%
+    \if\relax\detokenize\expandafter{\the\pgfutil@everybye}\relax\else
+        \expandafter\clearpage\expandafter\the\expandafter\pgfutil@everybye
+    \fi}}
 
 % \@ifl@t@r is defined \@onlypremable so we have to save it here
 \let\pgfutil@ifl@t@r=\@ifl@t@r