Fix #191 need to check for psycopg2.InternalError too

This fix corrects the problem when used with django-simple-import
https://github.com/burke-software/django-simple-import/issues/37

tenant_schemas/postgresql_backend/base.py

@@ -5,6 +5,7 @@ from django.utils.importlib import import_module
 from django.core.exceptions import ImproperlyConfigured, ValidationError
 from tenant_schemas.utils import get_public_schema_name, get_limit_set_calls
 import django.db.utils
+import psycopg2
 
 ORIGINAL_BACKEND = getattr(settings, 'ORIGINAL_BACKEND', 'django.db.backends.postgresql_psycopg2')
 
@@ -123,7 +124,7 @@ class DatabaseWrapper(original_backend.DatabaseWrapper):
             # we do not have to worry that it's not the good one
             try:
                 cursor.execute('SET search_path = {0}'.format(','.join(search_paths)))
-            except django.db.utils.DatabaseError:
+            except (django.db.utils.DatabaseError, psycopg2.InternalError):
                 self.search_path_set = False
             else:
                 self.search_path_set = True