Upload plugin. Ensure all files are extracted

[AndreiMaz]

I tried to upload several plugins from a single zip and some of the files from the Zip were not copied.
By quickly looking at the code I noticed this in the UploadMultiplePlugins method:

if (!Directory.Exists(directoryPath))
Directory.CreateDirectory(directoryPath);
else
entry.ExtractToFile(entryPath);

the code above skips the first file in a folder.
It should be without the else clause in order to work properly.

if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}

entry.ExtractToFile(entryPath);

Unfortunately we don't have much time to test this more as we are busy with the upgrade of the themes and plugins but I would suggest you to test this functionality a bit more.

Source: https://www.nopcommerce.com/boards/t/48672/nopcommerce-40-bug-fixes-and-improvements.aspx?p=5#195182