Remove HTML tags from description in assigment PDF.

Fix usage of clearfix in assignment templates.

openslides/assignments/static/js/assignments/pdf.js

@@ -47,7 +47,7 @@ angular.module('OpenSlidesApp.assignments.pdf', ['OpenSlidesApp.core.pdf'])
                             style: 'textItem'
                         },
                         {
-                            text: assignment.description,
+                            text: $(assignment.description).text(),
                             style: 'textItem',
                             margin: [10, 0, 0, 0]
                         }

openslides/assignments/static/templates/assignments/assignment-detail.html

@@ -75,12 +75,12 @@
 </div>
 
 <div class="details">
-  <div ng-if="assignment.description">
+  <div ng-if="assignment.description" class="clearfix">
     <h3 translate>Description</h3>
     <div ng-bind-html="assignment.description | trusted"></div>
   </div>
 
-  <div ng-if="assignment.phase !== 2" class="clearfix">
+  <div ng-if="assignment.phase !== 2">
     <h3 translate>Candidates</h3>
     <div ui-tree="treeOptions" ng-if="assignment.assignment_related_users.length"
         data-empty-placeholder-enabled="false">

openslides/assignments/static/templates/assignments/slide_assignment.html

@@ -11,11 +11,11 @@
   <!-- Description -->
   <div ng-if="!showResult && assignment.description !== ''"
     ng-bind-html="assignment.description | trusted"
-    class="zoomcontent">
+    class="zoomcontent clearfix">
   </div>
 
   <!-- Candidates -->
-  <div class="zoomcontent" ng-if="!showResult" class="clearfix">
+  <div class="zoomcontent" ng-if="!showResult">
     <h3 translate>Candidates</h3>
     <ul>
       <li ng-repeat="related_user in assignment.assignment_related_users | orderBy:'weight'">