Oops. Forgot to delete one more template.

common/lib/xmodule/xmodule/js/fixtures/lti_iframe_url_empty.html

-<div class="lti-wrapper">
-    <div id="lti_id" class="lti" data-open_in_a_new_page="false">
-
-        <form
-            action=""
-            name="ltiLaunchForm"
-            class="ltiLaunchForm"
-            method="post"
-            target="ltiLaunchFrame"
-            enctype="application/x-www-form-urlencoded"
-        >
-            <input name="launch_presentation_return_url" value="" />
-            <input name="lti_version" value="LTI-1p0" />
-            <input name="user_id" value="student" />
-            <input name="oauth_nonce" value="28347958723982798572" />
-            <input name="oauth_timestamp" value="2389479832" />
-            <input name="oauth_consumer_key" value="" />
-            <input name="lis_result_sourcedid" value="" />
-            <input name="oauth_signature_method" value="HMAC-SHA1" />
-            <input name="oauth_version" value="1.0" />
-            <input name="role" value="student" />
-            <input name="lis_outcome_service_url" value="" />
-            <input name="oauth_signature" value="89ru3289r3ry283y3r82ryr38yr" />
-            <input name="lti_message_type" value="basic-lti-launch-request" />
-            <input name="oauth_callback" value="about:blank" />
-
-            <input type="submit" value="Press to Launch" />
-        </form>
-
-        <h3 class="error_message">
-            Please provide launch_url. Click "Edit", and fill in the
-            required fields.
-        </h3>
-
-    </div>
-</div>