Removed duplicated flash messages on embed page

templates/base.html

@@ -113,9 +113,11 @@
 				{% else %}
 				<div class="col-xs-12 col-md-offset-{{ page_border }} col-md-{{ 12-(2*page_border) }}">
 				{% endif %}
+					{% block alerts %}
 					{% for msg in get_flashed_messages(category_filter=["message"]) %}
 					<div class="hidden-print alert alert-danger" role="alert">{{ msg|safe }}</div>
 					{% endfor %}
+					{% endblock %}
 					{% for msg in get_announcements(min_announcement_level) if (not request.cookies['alert-info-'+msg.id|string]) %}
 					<div class="hidden-print alert alert-{{levels.get(msg.level, ('info', ''))[0]}}" role="alert">
 						<a href="#" class="close" data-dismiss="alert" aria-label="close" onclick="Cookies.set('alert-info-{{msg.id}}', '1');">&times;</a>

templates/embed.html

@@ -5,6 +5,8 @@
 {% block title %}- {{ course.title }}: {{ lecture.title}}{% endblock %}
 {% block navbar %}
 {% endblock %}
+{% block alerts %}
+{% endblock %}
 {% block content %}
 <div class="row">
 	<div class="col-xs-12" style="padding: 0px">