Test for 'title' and thus correct parsing of pages
Test for 'title' and thus correct parsing of pages

Independent of the 'date', the second problem concerning #163 is that in
general, malformed YML-headers weren't handled.  This is now done
generically by enforcing the reasonable assumption that each page must
have a title, thus accessing `page.meta`, leading to a fail *in
advance* (at loading time) instead of at runtime.

Fix #163

agdsn/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,agdsn/sipa,agdsn/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,MarauderXtreme/sipa,agdsn/sipa