Do nothing when "No selection" entry is selected. That entry is at index=0.
Do nothing when "No selection" entry is selected.
That entry is at index=0.

BUG=cros:3361
TEST=Select secure network and cancel dialog. Select first entry at network combobox. It should not crash.

Review URL: http://codereview.chromium.org/2074020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@47908 0039d316-1c4b-4281-b951-d872f2087c98

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