Made e-mail address optional in batch checker website interface.

mutalyzer/website/templates/batch-jobs.html

@@ -37,10 +37,11 @@
     </div>
 
     <div class="form-group">
-      <label for="email">Email address</label>
-      <input name="email" id="email" type="email" class="form-control with-mailcheck"
+      <label for="email">Email address (optional)</label>
+      <input name="email" id="email" type="email"
+             class="form-control with-mailcheck"
              placeholder="Email address (notification will be sent here)"
-             required value="{{ email }}">
+             value="{{ email }}">
     </div>
 
     <div class="form-group">

mutalyzer/website/views.py

@@ -907,7 +907,7 @@ def batch_jobs_submit():
     errors = []
 
     if not email:
-        errors.append('Please provide an email address.')
+        email = '{}@webservice'.format(request.remote_addr)
 
     if job_type not in BATCH_JOB_TYPES:
         errors.append('Invalid batch job type.')