Windows Installer XML (WiX) toolset

Product/@Name and Product/@Manufacturer values with only whitespace should
be treated by Candle in the same way as null or empty attributes.

Repro Steps:
1. Author a package with this Product element.
<Product Id="*" Name=" " Language="1033" Version="0.0.0.0" Manufacturer=" "
UpgradeCode="{B6321235-E6E2-47ed-AB00-5DC6E85AECDF}">

Product/@Name contains tabs, Product/@Manufacturer contains a space.

2. Compile and Link

Expected: Compile error similar to

c:\product.wxs(3) : error CNDL0006 : The Product/@Name attribute's value
cannot be an empty string. If you want the value to be null or empty,
simply remove the entire attribute.
c:\product.wxs(3) : error CNDL0006 : The Product/@Manufacturer attribute's
value cannot be an empty string. If you want the value to be null or empty,
simply remove the entire attribute.:

Actual: The _SummaryInformation.idt file is created with null values for
Name and Manufacturer. See the attached file - properties 3 and 4. This
results in a Light error when importing the .idt:

C:\Users\jordanf\AppData\Local\Temp\dbl9tuiw\_SummaryInformation.idt :
error LGHT0136 : There was an error importing table '_SummaryInformation'
from this file.