[bugfix] setting Datastructure to obspydmt or None caused crash and corrupted QSettings

pylot/core/io/data.py

@@ -733,6 +733,22 @@ class PilotDataStructure(GenericDataStructure):
         self.setExpandFields(['root', 'database'])
 
 
+class ObspyDMTdataStructure(GenericDataStructure):
+    """
+    Object containing the data access information for the old PILOT data
+    structure.
+    """
+
+    def __init__(self, **fields):
+        if not fields:
+            fields = {'database': '',
+                      'root': ''}
+
+        GenericDataStructure.__init__(self, **fields)
+
+        self.setExpandFields(['root', 'database'])
+
+
 class SeiscompDataStructure(GenericDataStructure):
     """
     Dictionary containing the data access information for an SDS data archive:

pylot/core/util/structure.py

@@ -6,7 +6,7 @@ Created on Wed Jan 26 17:47:25 2015
 @author: sebastianw
 """
 
-from pylot.core.io.data import SeiscompDataStructure, PilotDataStructure
+from pylot.core.io.data import SeiscompDataStructure, PilotDataStructure, ObspyDMTdataStructure
 
 DATASTRUCTURE = {'PILOT': PilotDataStructure, 'SeisComP': SeiscompDataStructure,
-                 'obspyDMT': None, None: None}
+                 'obspyDMT': ObspyDMTdataStructure, None: PilotDataStructure}