Replace the Http404 in release/views.py if the changelog file is not

found with a simple error message, this mimicks the way the rest of the
Datatracker is handling missing files and avoids an annoying 404 when
running the test-crawler without all directories set up
 - Legacy-Id: 7105

Author: OleLaursen

ietf/release/views.py

@@ -4,7 +4,7 @@
 from django.template import RequestContext
 from django.shortcuts import render_to_response
 from django.conf import settings
-from django.http import Http404
+from django.http import HttpResponse
 
 import changelog
 
@@ -13,14 +13,14 @@ def release(request, version=None):
     if os.path.exists(settings.CHANGELOG_PATH):
         log_entries = changelog.parse(settings.CHANGELOG_PATH)
     else:
-        raise Http404()
+        return HttpResponse("Error: changelog file %s not found" % settings.CHANGELOG_PATH)
     next = None
     for entry in log_entries:
         if next:
             next.prev = entry
         entry.next = next
         next = entry
-    entries = dict([ (entry.version, entry) for entry in log_entries])
+    entries = dict((entry.version, entry) for entry in log_entries)
     if version == None or version not in entries:
         version = log_entries[0].version        
     return render_to_response('release/release.html', { 'releases': log_entries, 'version': version, 'entry': entries[version], }, context_instance=RequestContext(request))