Update six requirement from <1.11.0 to <1.14.0

Updates the requirements on [six](https://github.com/benjaminp/six) to permit the latest version.
- [Release notes](https://github.com/benjaminp/six/releases)
- [Changelog](https://github.com/benjaminp/six/blob/master/CHANGES)
- [Commits](benjaminp/six@1.0.0b1...1.13.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

 - Fix build

geonode/geoserver/signals.py

@@ -309,6 +309,7 @@ def fetch_gs_resource(values, tries):
 
         if not settings.FREETEXT_KEYWORDS_READONLY:
             try:
+                # AF: Warning - this won't allow people to have empty keywords on GeoNode
                 if len(instance.keyword_list()) == 0 and gs_resource.keywords:
                     for keyword in gs_resource.keywords:
                         if keyword not in instance.keyword_list():

geonode/layers/views.py

@@ -1101,9 +1101,11 @@ def layer_metadata(
         new_regions = [x.strip() for x in layer_form.cleaned_data['regions']]
 
         layer.keywords.clear()
-        layer.keywords.add(*new_keywords)
+        if new_keywords:
+            layer.keywords.add(*new_keywords)
         layer.regions.clear()
-        layer.regions.add(*new_regions)
+        if new_regions:
+            layer.regions.add(*new_regions)
         layer.category = new_category
         layer.save()
 

requirements.txt

@@ -6,7 +6,7 @@ psycopg2==2.8.4
 Django==1.11.26
 
 # Other
-amqp==2.5.2
+amqp==2.5.1
 pyyaml>=4.2b1
 beautifulsoup4==4.8.1
 httplib2<0.14.1
@@ -19,7 +19,7 @@ decorator==4.4.1
 celery==4.2.1
 kombu==4.6.5
 boto<=2.49.0
-six<1.11.0 # https://github.com/benjaminp/six/issues/210
+six<1.14.0
 tqdm==4.37.0
 Deprecated==1.2.6
 wrapt==1.11.2
@@ -63,7 +63,7 @@ django-celery-beat==1.5.0
 django-floppyforms<1.9.0
 django-forms-bootstrap<=3.1.0
 django-activity-stream==0.8.0
-django-autocomplete-light==2.3.3 # pinned because >=2.3.4 throw an exception on startup
+django-autocomplete-light<3.0.0
 django-basic-authentication-decorator==0.9
 django-leaflet==0.25.0
 django-invitations<=1.9.2