fix: flaskr data dir reference when config not available

.gitignore

@@ -13,3 +13,4 @@ ambianic/webapp/bower_components/paper/
 **/coverage.xml
 **/.__*
 _mdwriter.cson
+**/timeline-event-log.yaml

src/ambianic/webapp/flaskr.py

@@ -16,13 +16,18 @@
 
 # configuration
 DEBUG = True
+DEFAULT_DATA_DIR = './data'
 
 
 class FlaskJob(ManagedService):
 
     def __init__(self, config):
         self.config = config
-        data_dir = config.get('data_dir', './data')
+        data_dir = None
+        if config:
+            data_dir = config.get('data_dir', None)
+        if not data_dir:
+            data_dir = DEFAULT_DATA_DIR
         self.srv = None
         app = create_app(data_dir=data_dir)
         self.srv = make_server('0.0.0.0', 8778, app)