Connection: validate whether uid and seqno is positive

lib/Connection.js

@@ -1818,10 +1818,17 @@ function validateUIDList(uids, noThrow) {
         return err;
       else
         throw err;
-    } else if (typeof uids[i] !== 'number')
+    } else if (intval <= 0) {
+      var err = new Error('UID/seqno must be greater than zero');
+      if (noThrow)
+        return err;
+      else
+        throw err;
+    } else if (typeof uids[i] !== 'number') {
       uids[i] = intval;
     }
   }
+}
 
 function hasNonASCII(str) {
   for (var i = 0, len = str.length; i < len; ++i) {