add data_pdf block to latex templates

IPython/nbconvert/templates/latex/base.tplx

@@ -60,6 +60,13 b' it introduces a new line'
 \end{center}
 ((*- endblock -*))
 
+((*- block data_pdf -*))
+\begin{center}
+\includegraphics[width=0.7\textwidth]{(((output.pdf_filename[:-4])))}
+\par
+\end{center}
+((*- endblock -*))
+
 ((* block pyout *))
 ((* block data_priority scoped *))((( super() )))((* endblock *))
 ((* endblock pyout *))

IPython/nbconvert/templates/latex/sphinx_base.tplx

@@ -358,6 +358,10 b' Note: For best display, use latex syntax highlighting. =))'
     ((( conditionally_center_output(insert_graphics(output.svg_filename)) )))
 ((*- endblock -*))
 
+((*- block data_pdf -*))
+    ((( conditionally_center_output(insert_graphics(output.pdf_filename[:-4])) )))
+((*- endblock -*))
+
 ((*- block data_latex *))
     ((* if resources.sphinx.centeroutput *))\begin{center}((* endif -*))((( output.latex | rm_math_space )))((*- if resources.sphinx.centeroutput *))\end{center} ((* endif -*))
 ((*- endblock -*))