when keywords empty, not displaying keywords detail tab
added extent for books
added place and edition information for book and added it to list and detail view
contentforTag returns null when object empty or length=0
modified textforQuery returns now objects, added places and series function, and added series to detail view
removed trailing spaces
now checks for status nicht ausleihbar
Merge pull request #42 from University-of-Potsdam-MM/library-fixes

Library fixes