Bump lint workflow py version

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: '3.6'
+          python-version: '3.7'
       - name: Install requirements
         run: pip install flake8 pycodestyle
       - name: Check syntax

ckanext/spatial/util.py

@@ -15,9 +15,13 @@ from pprint import pprint
 from ckan import model
 from ckan.model.package_extra import PackageExtra
 
-from ckanext.spatial.lib.reports import validation_report
-from ckanext.spatial.harvesters import SpatialHarvester
-from ckanext.spatial.harvested_metadata import ISODocument
+try:
+    from ckanext.spatial.lib.reports import validation_report
+    from ckanext.spatial.harvesters import SpatialHarvester
+    from ckanext.spatial.harvested_metadata import ISODocument
+except ImportError:
+    # ckanext-harvest not loaded
+    pass
 
 from ckantoolkit import config