I thought I'd seen a problem with the combo box in the "Capture:Start"

dialog box if we hadn't found any interfaces on which we could capture,
but perhaps the problem was that "gtk_combo_set_popdown_strings()"
doesn't like it if you set the list of items to a NULL list - if you
don't set it at all, you get a combo box with only one blank entry in
the list, but you don't seem to get complaints from GTK+ 1.2.6, at
least.

Pop up the "Capture:Start" dialog box even if we don't find any
interfaces on which we could capture; at least this way, they won't just
get confronted with a

	There are no network interfaces that can be opened.
	Please check to make sure you have sufficient permission
	to capture packets.

message box and no way to give us any more information other than "it
said 'There are no network interfaces that can be opened...'" - they can
at least try the interfaces that *should* work, and report the error
messages they get, giving us a better chance at figuring out what the
problem is.

Trim white space from the entry in that combo box, and, if there isn't
anything other than possibly white space, pop up a

	You didn't specify an interface on which to capture packets.

message box and leave the dialog box up so that the user can supply an
interface name.

svn path=/trunk/; revision=1373

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