Bad interaction between node coloring, load network from database, and export to Excel

[kdahlquist]

As noted in issue #977, the node coloring menu should be activated all the time now because we have a gene expression database. One fallout is this interaction. Do the following:

• load a demo file
• load a network from the database
• the node coloring panel/menu is now active, with the enable node coloring checkbox checked, but no node coloring is showing on the graph
• Export to Excel and the modal opens, but you can't actually click on anything (radio buttons or other buttons) nothing works.

[Onariaginosa]

I fixed this and it should make its way into the never ending pr #996. The grnState.node.coloring.topDataset and grnState.nodeColoring.bottomDataset settings weren't getting when a user generates a new network, so I set them = to undefined and it worked.

[kdahlquist]

confirmed fixed in beta 6.0.7