[kronolith] Empty line at the beginning of .ics files

[Torsten Kockler]

Hi!

If I access the ics-file from the WebDAV/ICS subscription address, the file 
always starts with a newline '\n' before the  "BEGIN:VCALENDAR".

0000000  nl   B   E   G   I   N   :   V   C   A   L   E   N   D   A   R
0000020  cr  nl   V   E   R   S   I   O   N   :   2   .   0  cr  nl   X

Unfortunately this breaks the parsing of the file in my Android-Phone App (ICSSync).

horde                        5.2.9   stable
kronolith                    4.2.15  stable
php5                           5.6.17+dfsg-0+deb8u1
apache2                        2.4.10-10+deb8u4

If this is a misconfiguration maybe you can give me a hint where I can start 
digging.

Thanks
Torsten