UPD: try to make useful test stuff.

dav_base/config/modules.py

@@ -98,8 +98,11 @@ class ModuleConfig(object):
 
         self._modules = dict()
 
-        with open(path, 'r') as f:
-            data = json.load(f)
+        if os.path.exists(path):
+            with open(path, 'r') as f:
+                data = json.load(f)
+        else:
+            data = dict()
 
         if 'modules' in data:
             for meta_dict in data['modules']: