Fix bug with create job

Problem was so: if you create new job and not set interval - periodic task will be created along

esi/scraper/views.py

@@ -77,6 +77,7 @@ class NewJobCreateView(CreateView):
         query = request.POST.get('query')
         job = Job.objects.create(name=name, spider=spider, query=query)
         interval = request.POST.get('interval')
+        if interval:
             every = request.POST.get('count')
             every = int(every) if every else None
             job.schedule_job = make_periodic_task(job.id, schedule(interval, every))