Fix table row editing crash

[sm11963]

There is a crash when editing any field in a row and then attempting to import configuration.

XcodeUniversalSearch/XcodeUniversalSearch/CommandTableViewController.swift

Lines 105 to 106 in 70870fe

	// TODO handle case where this goes out of range (row = -1)
	// Repro: Start editing a row, while editing, do an import