[images] Fix create_default_topology condition check #421

Fix if condition checking if the default topology should be created.

Fixes #421

images/openwisp_dashboard/load_init_data.py

@@ -254,6 +254,6 @@ def create_default_topology(vpn):
     create_default_credentials()
     create_ssh_key_template()
 
-    if os.environ.get('USE_OPENWISP_TOPOLOGY', False):
+    if os.environ.get('USE_OPENWISP_TOPOLOGY', False) == "True":
         Topology = load_model('topology', 'Topology')
         create_default_topology(default_vpn)