Merge branch 'issue13' into 'master'

Issue 13 (Empty subtitles waste space on title slides)

See merge request !8
2 jobs for master in 12 seconds (queued for 59 minutes and 55 seconds)
Status Job ID Name Coverage
  Test
failed #39470
tests

00:00:12

failed #39464
tests

00:00:05

 
Name Stage Failure
failed
tests Test
 ...                                              

l.25 ...ics[width=\textwidth]{../minimal/minimal}}

! ==> Fatal error occurred, no output PDF file produced!
Transcript written on tutorial.log.
Makefile:23: recipe for target 'pdflatex/tutorial' failed
make: *** [pdflatex/tutorial] Error 1
ERROR: Job failed: exit code 1