Merge pull request #583 from cehbrecht/fix-ogr-import

avoid ogr import failure when running tests

Author: cehbrecht

pywps/dependencies.py

@@ -10,6 +10,7 @@
     from osgeo import gdal, ogr
 except ImportError:
     warnings.warn('Complex validation requires GDAL/OGR support.')
+    ogr = None
 
 try:
     import netCDF4