Don't choke if the user hits a space or something in the 'changed in

buglist.cgi

@@ -238,8 +238,19 @@ if {[info exists FORM(sql)]} {
   }
 
   if {[lookup FORM changedin] != ""} {
+      set c [string trim $FORM(changedin)]
+      if {$c != ""} {
+          if {![regexp {^[0-9]*$} $c]} {
+              puts "
+The 'changed in last ___ days' field must be a simple number.  You entered 
+\"$c\", which doesn't cut it.
+
+Click the Back button and try again."
+              exit
+          }
           qadd "and to_days(now()) - to_days(bugs.delta_ts) <= $FORM(changedin) "
       }
+  }
 }
 
 if {[info exists FORM(order)]} {