Null pointer when reindexing edge list

[raahlb]

Don't copy value_type if not needed, as source's m_property will be set to null when copied.

See https://svn.boost.org/trac10/ticket/13544.

[jeremy-murphy]

Would it be relatively easy to add a test-case that fails without this fix?

[raahlb]

I added a test case. Also added it to the Jamfile.v2. Not used to this test system, so please verify I did it in the right way.

[anadon]

I'm helping out with the PR backlog. Looks like you have a bugfix, test, and no new examples will be needed. This will be in the first batch of merged PR's. This is to let you know and help me prioritize PR's.

[anadon]

Your test file was not included in the test directory. Make sure you added it to git.

[anadon]

I see what happened. The test you added has a different file name than the test file you added. I'll just fix that up.

[raahlb]

Missed that you wrote that you had fixed it yourself. Not super important, but the name "delete edge" is a bit misleading, it's actually a vertex that is being deleted in the test. Sorry about that.

Thanks!

[jzmaddock]

Are these changes in #114? If so this can be closed now.

[anadon]

These changes are in #114 and so this should be closed.