Don't bother checking whether the filter string is empty - just use it

even if it's empty, rather than using an empty string instead of it if
it's empty.

Also, "gtk_entry_get_text()" appears, from the documentation, always to
return a non-null pointer (and it returned a non-null pointer when I
started a capture with an empty filter string); don't supply a null
string if it's null, just do a "g_assert()" to make sure it's non-null.

Put in a comment explaining why we aren't trying to be clever and
detecting an empty filter string and setting "cf.filter" to NULL if it's
empty.

svn path=/trunk/; revision=1423

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