assertion fails when parsing empty playlist

medialibrary fails with an assertion when parsing empty playlist :

version: 3dddb7b1

file: lol.asx

logs:

[...]
[00007f1530050a80] main input debug: Creating an input for preparsing '08 - Beastie Boys - Root down.mp3'
[000055e71868b530] medialibrary medialibrary debug: src/parser/ParserWorker.cpp:179 mainloop [Metadata] has 49 tasks remaining
[000055e71868b530] medialibrary medialibrary debug: src/parser/ParserWorker.cpp:198 mainloop Executing Metadata task on file:///home/pierre/Videos/mpgeg_ts_progressive.ts
[000055e71868b530] medialibrary medialibrary debug: src/metadata_services/MetadataParser.cpp:524 createFileAndMedia Adding file:///home/pierre/Videos/mpgeg_ts_progressive.ts
[000055e71868b530] medialibrary medialibrary debug: src/discoverer/FsDiscoverer.cpp:264 checkFolder Checking for modifications in smb://192.168.1.91/Music/Muse/
[000055e71868b530] medialibrary medialibrary debug: src/discoverer/FsDiscoverer.cpp:285 checkFolder New folder detected: smb://192.168.1.91/Music/Muse/Absolution/
[00007f152c08dae0] main input debug: Creating an input for preparsing 'smb://192.168.1.91/Music/Muse/Absolution/'
[000055e71868b530] medialibrary medialibrary debug: src/parser/ParserWorker.cpp:220 mainloop Done executing Metadata task on file:///home/pierre/Videos/mpgeg_ts_progressive.ts in 51ms. Result: 1
[000055e71868b530] medialibrary medialibrary debug: src/parser/ParserWorker.cpp:179 mainloop [Metadata] has 48 tasks remaining
[000055e71868b530] medialibrary medialibrary debug: src/parser/ParserWorker.cpp:198 mainloop Executing Metadata task on file:///home/pierre/Videos/lol.asx
vlc: src/metadata_services/MetadataParser.cpp:135: virtual medialibrary::parser::Status medialibrary::parser::MetadataAnalyzer::run(medialibrary::parser::IItem&): Assertion `item.nbSubItems() > 0' failed.