Fix for bug 90333: Bugzilla now displays an appropriate error message if a user hits process_bug.cgi without specifying any bugs to change.

Patch by Myk Melez <myk@mozilla.org>
r=jake@acutex.net

webtools/bugzilla/process_bug.cgi

@@ -68,6 +68,11 @@ if (defined $::FORM{'id'}) {
     }
 }
 
+# Make sure there are bugs to process.
+scalar(@idlist)
+  || DisplayError("You did not select any bugs to modify.")
+  && exit;
+
 # For each bug being modified, make sure its ID is a valid bug number 
 # representing an existing bug that the user is authorized to access.
 foreach my $id (@idlist) {