[bugfix] #267 Remove stations from ArrayMap whose metadata files were removed

Fixes https://ariadne.geophysik.ruhr-uni-bochum.de/trac/PyLoT/ticket/267

PyLoT.py

@@ -2906,6 +2906,10 @@ class MainWindow(QMainWindow):
         self.get_metadata will be called.
         '''
         self.tabs.setCurrentIndex(1)
+        # if there is no metadata (invetories is an empty list), just initialize the default empty tab
+        if not self.metadata.inventories:
+            self.init_array_tab()
+            return
         if hasattr(self, 'metadata_widget'):
             if self.metadata_widget:
                 self.metadata_widget.setParent(None)

pylot/core/util/dataprocessing.py

@@ -85,6 +85,9 @@ class Metadata(object):
         for seed_id in self.seed_ids.keys():
             if self.seed_ids[seed_id].startswith(path_to_inventory):
                 del (self.seed_ids[seed_id])
+        # have to clean self.stations_dict as well
+        # this will be rebuilt for the next init of the arraymap anyway, so just reset it
+        self.stations_dict = {}
 
     def get_metadata(self, seed_id, time=None):
         """