ZipFile.Delete on a folder entry fails #48

PartOfZipFile.cs

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		int FindExistingUpdate(ZipEntry entry)
		{
			int result = -1;
			string convertedName = GetTransformedFileName(entry.Name);
			if (updateIndex_.ContainsKey(convertedName))
			{
			    result = (int) updateIndex_[convertedName];
			}
			else
			{
		                convertedName = GetTransformedDirectoryName(entry.Name);
                		if (updateIndex_.ContainsKey(convertedName))
		                {
		                    result = (int)updateIndex_[convertedName];
		                }
			}
/*
			// This is slow like the coming of the next ice age but takes less storage and may be useful
			// for CF?
			for (int index = 0; index < updates_.Count; ++index)
			{
				ZipUpdate zu = ( ZipUpdate )updates_[index];
				if ( (zu.Entry.ZipFileIndex == entry.ZipFileIndex) &&
					(string.Compare(convertedName, zu.Entry.Name, true, CultureInfo.InvariantCulture) == 0) ) {
					result = index;
					break;
				}
			}
 */
			return result;
		}

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