check logged Character for NULL

views/html/introduction/index.tpl

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+<h1><?=_('Introduction')?></h1>
+<p>Ein Projekt zum Thema „Gamification im Lehrumfeld“ – basierend auf <a href="http://legende-von-zyren.de">Die Legende von Zyren</a>.</p>
+
+<?php if(is_null($userId)) : ?>
+<h2><?=_('Login')?></h2>
+<form method="post" action="<?=$linker->link(array('users','login'))?>">
+	<fieldset>
+		<label for="username"><?=_('Username')?>:</label>
+		<input name="username" type="text" placeholder="<?=_('Username')?>" title="<?=_('Username')?>" required="required" /><br />
+		<label for="password"><?=_('Password')?>:</label>
+		<input name="password" type="password" placeholder="<?=_('Password')?>" title="<?=_('Password')?>" required="required" /><br />
+	</fieldset>
+	<input type="submit" name="login" value="<?=_('Login')?>" />
+	<?=_('or')?> <a href="<?=$linker->link(array('users','register'))?>"><?=_('register yourself')?></a>
+</form>
+<?php endif ?>
+
+<h2>Entwickler</h2>
+<ul>
+	<li itemscope itemtype="http://schema.org/Person">
+		<span itemprop="name">Oliver Hanraths</span><br />
+		Programmierung und Datenbank
+	</li>
+	<li itemscope itemtype="http://schema.org/Person">
+		<span itemprop="name">Daniel Miskovic</span><br />
+		GUI und Webdesign
+	</li>
+	<li itemscope itemtype="http://schema.org/Person">
+		<span itemprop="name">Kathrin Knautz</span>, <span itemprop="honorificSuffix">B.A., M.A.</span><br />
+		Leitung
+	</li>
+</ul>
+
+<p itemscope itemtype="http://schema.org/CollegeOrUniversity">
+	<a itemprop="name" href="http://www.uni-duesseldorf.de">Heinrich-Heine-Universität Düsseldorf</a>
+</p>