404 on crawl not found

bgpdata/views.py

@@ -6,7 +6,12 @@ def overview(request):
 	return render(request, 'bgpdata/overview.html', {"crawls": crawls})
 
 def showMap(request, crawlId):
-	crawl = CrawlRun.objects.get(id=crawlId)
+	crawl = None
+	try:
+		crawl = CrawlRun.objects.get(id=crawlId)
+	except CrawlRun.DoesNotExist:
+		return render(request, "bgpdata/no-map-found.html", {"crawl_id": crawlId})
+
 	ASses = AS.objects.filter(crawl=crawl)
 	peerings = Peering.objects.filter(as1__crawl=crawl)