test: drop template DB when something goes wrong during creation

Fixes #951.

test/bdd/environment.py

@@ -86,6 +86,7 @@ class NominatimEnvironment(object):
             # just in case... make sure a previous table has been dropped
             self.db_drop_database(self.template_db)
 
+        try:
             # call the first part of database setup
             self.write_nominatim_config(self.template_db)
             self.run_setup_script('create-db', 'setup-db')
@@ -113,6 +114,10 @@ class NominatimEnvironment(object):
                                       'create-search-indices',
                                       osm_file=fd.name,
                                       osm2pgsql_cache='200')
+        except:
+            self.db_drop_database(self.template_db)
+            raise
+
 
     def setup_api_db(self, context):
         self.write_nominatim_config(self.api_test_db)