Also check for empty content length

[rullzer]

My guess it this is caused by php 7.2

I was debugging the client with the https://github.com/nextcloud/end_to_end_encryption app. To encrypt a folder a PUT request is send to

<server>/ocs/v2.php/apps/end_to_end_encryption/api/v1/encrypted/<fileid>

Without this patch this will fail. Because we don't correctly get the id from the urlparameters.

[codecov]

Codecov Report

Merging #7523 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #7523      +/-   ##
============================================
- Coverage     51.16%   51.16%   -0.01%     
- Complexity    24865    24866       +1     
============================================
  Files          1601     1601              
  Lines         94683    94684       +1     
  Branches       1368     1368              
============================================
- Hits          48446    48443       -3     
- Misses        46237    46241       +4

Impacted Files	Coverage Δ	Complexity Δ
lib/private/AppFramework/Http/Request.php	92.7% <100%> (+0.02%)	149 <0> (+1)	⬆️
core/js/js.js	62.98% <0%> (-0.57%)	0% <0%> (ø)
apps/files_trashbin/lib/Trashbin.php	72.53% <0%> (+0.24%)	136% <0%> (ø)	⬇️