rpm-ostree: Use 'Unknown' for the deploymenet size

libdiscover/backends/RpmOstreeBackend/RpmOstreeResource.cpp

@@ -295,6 +295,11 @@ quint64 RpmOstreeResource::size()
     return 0;
 }
 
+QString RpmOstreeResource::sizeDescription()
+{
+    return QStringLiteral("Unknown");
+}
+
 QDate RpmOstreeResource::releaseDate() const
 {
     return m_timestamp;

libdiscover/backends/RpmOstreeBackend/RpmOstreeResource.h

@@ -35,6 +35,7 @@ public:
     QString section() override;
     void fetchScreenshots() override {};
     quint64 size() override;
+    QString sizeDescription() override;
     void fetchChangelog() override {};
     QStringList extends() const override;
     AbstractResource::Type type() const override;