don't create sorter instances when none was requested

[blizzz]

No description provided.

[codecov]

Codecov Report

Merging #7324 into master will increase coverage by <.01%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master    #7324      +/-   ##
============================================
+ Coverage     50.86%   50.86%   +<.01%     
- Complexity    24538    24539       +1     
============================================
  Files          1584     1584              
  Lines         93794    93795       +1     
  Branches       1358     1358              
============================================
+ Hits          47705    47706       +1     
  Misses        46089    46089

Impacted Files	Coverage Δ	Complexity Δ
core/Controller/AutoCompleteController.php	76.47% <83.33%> (+0.71%)	6 <0> (+1)	⬆️
apps/files_trashbin/lib/Expiration.php	90.32% <0%> (-1.62%)	29% <0%> (ø)
lib/private/Server.php	82.62% <0%> (-0.12%)	126% <0%> (ø)
apps/files_trashbin/lib/Trashbin.php	72.53% <0%> (+0.24%)	136% <0%> (ø)	⬇️
lib/private/Security/CertificateManager.php	92.07% <0%> (+0.99%)	39% <0%> (ø)	⬇️