added 500 error template

templates/500.html

@@ -0,0 +1,29 @@
+{% extends "base.html" %}
+
+{% block body %}
+<section class="content-header">
+  <h1>
+    Analytics got error while doing some analytics
+  </h1>
+  <ol class="breadcrumb">
+    <li><a href="#"><i class="fa fa-dashboard"></i> Home</a></li>
+    <li class="active">500 error</li>
+  </ol>
+</section>
+
+<!-- Main content -->
+<section class="content">
+
+  <div class="error-page">
+    <h2 class="headline text-red">500</h2>
+    <div class="error-content">
+      <h3><i class="fa fa-warning text-red"></i> Oops! Something went wrong.</h3>
+      <p>
+        {{ error }}
+      </p>
+    </div>
+  </div><!-- /.error-page -->
+
+</section><!-- /.content -->
+
+{% end body %}