Normalize NPCG in a regex route's matches to empty strings for undefined

[ericf]

Fixes #1076

[ericf]

@rgrove I'm going to proceed with this change for code freeze, but we can discuss and revisit this if you have a better way to handle it. We'll just call it a "bug" in the next preview release and fix it by the final release.

[rgrove]

Sounds good!

On Monday, August 12, 2013, Eric Ferraiuolo wrote:

@rgrove https://github.com/rgrove I'm going to proceed with this change
for code freeze, but we can discuss and revisit this if you have a better
want to handle it. We'll just call it a "bug" in the next preview release
and fix it by the final release.

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