D12610: Avoid crashing on failed flatpak_installation_list_installed_refs_for_update

[David Edmundson]

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REVISION SUMMARY
  flatpak_installation_list_installed_refs_for_update can return null,
  clearly we expect this as we catch it above and show an waring. But on
  finished in the lambda we call refs->len, which obviously crashes.
  
  onFetchUpdatesFinished doesnt' do anything with an empty list.
  
  BUG: 393614

TEST PLAN
  None, just read backtrace and code.

REPOSITORY
  R134 Discover Software Store

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12610

AFFECTED FILES
  libdiscover/backends/FlatpakBackend/FlatpakNotifier.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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