dont have server send feedback messages when null
code review feedback
Merge pull request #802 from code-dot-org/flappyError

dont have server send feedback messages when null
Automatically built: commit 3f046560ff173fa0c1cda93553bcb504f7cd1b59
Author: Brent Van Minnen <bjvanminnen@gmail.com>
Date:   Thu Jun 12 10:04:08 2014 -0700

    remove extra BlocklyApps.

commit a322251eaa6b49c6bf365a7bef224ae6f660875d
Merge: 9b225a0 f33e7a2
Author: cpirich <chris@code.org>
Date:   Thu Jun 12 10:03:40 2014 -0700

    Merge pull request #666 from code-dot-org/fix_feedback_block_margins

    fix for iframe insertion

commit f33e7a2d6eb6fa5bcd46150bf2d5caf6d0b42cf9
Author: cpirich <chris@code.org>
Date:   Thu Jun 12 09:48:49 2014 -0700

    fix for iframe insertion
Merge pull request #803 from code-dot-org/finished

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