Handle 404 in CardDAV multi get - refs #829

[DeepDiver1975]

rebased #904

[codecov]

Codecov Report

Merging #1503 (e61f0a0) into master (9fb8b91) will decrease coverage by 0.01%.
The diff coverage is 96.77%.

@@             Coverage Diff              @@
##             master    #1503      +/-   ##
============================================
- Coverage     97.32%   97.32%   -0.01%     
- Complexity     2833     2841       +8     
============================================
  Files           175      175              
  Lines          9425     9443      +18     
============================================
+ Hits           9173     9190      +17     
- Misses          252      253       +1     

Files	Coverage Δ
lib/CardDAV/AddressBook.php	92.00% <100.00%> (+0.10%)	⬆️
lib/DAV/Client.php	92.62% <ø> (ø)
lib/DAV/Server.php	96.91% <100.00%> (+0.03%)	⬆️
lib/DAV/Xml/Element/Response.php	93.58% <100.00%> (ø)
lib/DAV/Tree.php	99.25% <92.30%> (-0.75%)	⬇️

📣 Codecov offers a browser extension for seamless coverage viewing on GitHub. Try it in Chrome or Firefox today!