[Exp PATCH] Bail out of Traceroute::trace() with no valid targets

The attached patch (/nmap-exp/kris SVN r4590) bails out of
Traceroute::trace() if no valid targets are given.

Here's the SVN log:

------------------------------------------------------------------------
r4590 | kris | 2007-03-19 11:47:57 -0500 (Mon, 19 Mar 2007) | 1 line

Bail out of Traceroute::trace() if no valid targets are available.
Before, it would essentially just run through the rest of the function
without doing much of anything. So if we were trying to traceroute a
machine that's directly connected, the "Initiating"/"Completed" messages
would still appear even though no tracing would be done.
------------------------------------------------------------------------

I wasn't sure if this (the printing of the "Initiating"/"Completed"
lines) was desirable or not. No TRACEROUTE table is printed if there
are no valid targets, and no actual tracing is done, so I didn't think
these should be printed. Plus, there's no need to go through the rest
of the function if there aren't any valid targets, anyway.

Lemme know what you think :)

Thanks,
Kris Katterjohn

Index: traceroute.cc
===================================================================
--- traceroute.cc (revision 4589)
+++ traceroute.cc (revision 4590)
@@ -814,6 +814,9 @@
      * legitimate to trace to */
     sendTTLProbes (Targets, valid_targets);
 
+ if (!valid_targets.size())
+ return;
+
     SPM = new ScanProgressMeter ("Traceroute");
 
     while (!readTraceResponses ()) {

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