MediaLibrary: Don't check for the amount of modified media when clearing the history

When no media is present, we still might want to clear the stream
history.

src/Media.cpp

@@ -549,7 +549,7 @@ std::vector<MediaPtr> Media::fetchHistory( MediaLibraryPtr ml )
     return fetchAll<IMedia>( ml, req );
 }
 
-bool Media::clearHistory(MediaLibraryPtr ml)
+void Media::clearHistory( MediaLibraryPtr ml )
 {
     auto dbConn = ml->getConn();
     static const std::string req = "UPDATE " + policy::MediaTable::Name + " SET "
@@ -558,7 +558,7 @@ bool Media::clearHistory(MediaLibraryPtr ml)
             "progress = 0";
     // Clear the entire cache since quite a few items are now containing invalid info.
     clear();
-    return sqlite::Tools::executeUpdate( dbConn, req );
+    sqlite::Tools::executeUpdate( dbConn, req );
 }
 
 }

src/Media.h

@@ -110,7 +110,7 @@ class Media : public IMedia, public DatabaseHelpers<Media, policy::MediaTable>
         static std::vector<MediaPtr> listAll(MediaLibraryPtr ml, Type type , SortingCriteria sort, bool desc);
         static std::vector<MediaPtr> search( MediaLibraryPtr ml, const std::string& title );
         static std::vector<MediaPtr> fetchHistory( MediaLibraryPtr ml );
-        static bool clearHistory( MediaLibraryPtr ml );
+        static void clearHistory( MediaLibraryPtr ml );
 
 
 private:

src/MediaLibrary.cpp

@@ -452,8 +452,7 @@ std::vector<MediaPtr> MediaLibrary::lastMediaPlayed() const
 bool MediaLibrary::clearHistory()
 {
     auto t = getConn()->newTransaction();
-    if ( Media::clearHistory( this ) == false )
-        return false;
+    Media::clearHistory( this );
     if ( History::clearStreams( this ) == false )
         return false;
     t->commit();