Fix crash if "@return" Doxygen tag was used on a node without any return
type (such as a class, for example). Ignoring it might not be the best
thing to do, but it's definitely better than crashing and it's not
really clear what else could be done anyhow.
Closes#1516.
Found via `codespell -q 3 -L "uint,bae,objext,cmo,goin,struc,ois,upto"`
whitespaces were unintentionally fixed due to my editors settings.
Rebased patch #1327
This is important to preserve the structure of the lists which appear
correctly in Python output without any additional effort if the indentation is
lost.
It is also makes the behaviour consistent for
/**
*
*
*/
comments and those without the asterisks in the middle lines, as now the
indentation is preserved in both cases while it was only preserved when the
asterisks were present previously.
