Fix subtle bug.

If one created a new project and then immediately deleted any tags and
applied the changes there would be an error which is now fixed.

vixen/project.py

@@ -231,7 +231,6 @@ def update_tags(self, new_tags):
         for tag in old_tags:
             if tag.name not in new_tag_names:
                 removed.append(tag)
-        self.tags = new_tags
 
         for tag in removed:
             del self._tag_data[tag.name]
@@ -240,6 +239,13 @@ def update_tags(self, new_tags):
         for tag in added:
             self._tag_data[tag.name] = [tag.default]*n_entries
 
+        # The above can be the first time when self._tag_data is accessed, when
+        # creating a new project for example. In this case,
+        # self.__tag_data_default is called, so if self.tags is set then the
+        # removed tags will not exist in _tag_data causing an error. So we only
+        # set self.tags below.
+        self.tags = new_tags
+
         # Update the cached media
         for m in self._media.values():
             for tag in removed:

vixen/vixen.py

@@ -29,7 +29,7 @@ class Vixen(HasTraits):
 
     def save(self):
         data = [dict(name=p.name, save_file=p.save_file)
-                for p in self.projects]
+                for p in self.projects if p.name != '__hidden__']
         with open(self.save_file, 'w') as fp:
             json.dump(data, fp)
 
@@ -522,9 +522,11 @@ def process(self, project):
         self.info("Remember to save the project once processing completes.")
 
     def remove(self, project):
-        logger.info('Removing project: %s', project.name)
+        name = project.name
+        logger.info('Removing project: %s', name)
         self.vixen.remove(project)
         self.editor.project = None
+        self.info('Removed project: %s' % name)
 
     def add_project(self):
         name = 'Project%d' % (len(self.vixen.projects))