bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'startswith'

[yacinec...@yahoo.com]

Greetings,

I have this error when launching bzr qlog and right clicking on the main window's upper pane (the pane containing the graph and the log lines)

bzr: ERROR: exceptions.AttributeError: 'NoneType' object has no attribute 'startswith'

Here's the file and the line that causes problem.

~/.bazaar/plugins/qbzr/lib/logwidget.py


    def show_context_menu(self, pos):
        branch_count = len(self.log_model.graph_viz.branches)
        (top_revid, old_revid), count = \
              self.get_selection_top_and_parent_revids_and_count()


# top_revid is None.

-->     wt_selected = top_revid.startswith(CURRENT_REVISION)
         
        def filter_rev_ancestor(action, is_ancestor=True):
            branch_menu = action.menu()
            if branch_menu:
                vis_branch_count = branch_menu.filter_rev_ancestor(
                                                        top_revid, is_ancestor)
                if vis_branch_count == 0:
                    action.setVisible(False)
        
        if self.view_commands:
            self.context_menu_show_tree.setVisible(count == 1)


If I change the code to something like : 

    def show_context_menu(self, pos):
        branch_count = len(self.log_model.graph_viz.branches)
        (top_revid, old_revid), count = \
              self.get_selection_top_and_parent_revids_and_count()


        wt_selected = None

        if top_revid : 
            wt_selected = top_revid.startswith(CURRENT_REVISION)
         
        def filter_rev_ancestor(action, is_ancestor=True):
            branch_menu = action.menu()
            if branch_menu:
                vis_branch_count = branch_menu.filter_rev_ancestor(
                                                        top_revid, is_ancestor)
                if vis_branch_count == 0:
                    action.setVisible(False)
        
        if self.view_commands:
            self.context_menu_show_tree.setVisible(count == 1)
        

I get this error : 

bzr: ERROR: exceptions.KeyError: 'key None not in nodes'

Traceback (most recent call last):
  File "/home/chaouche/.bazaar/plugins/qbzr/lib/logwidget.py", line 619, in show_context_menu
    is_ancestor=False)
  File "/home/chaouche/.bazaar/plugins/qbzr/lib/logwidget.py", line 600, in filter_rev_ancestor
    top_revid, is_ancestor)
  File "/home/chaouche/.bazaar/plugins/qbzr/lib/logwidget.py", line 652, in filter_rev_ancestor
    self.graphprovider.known_graph.heads((branch_tip, rev)))
  File "_known_graph_pyx.pyx", line 444, in bzrlib._known_graph_pyx.KnownGraph.heads
KeyError: 'key None not in nodes'


That latter file seems to be generated or something, it doesn't even have a path like the others. 

Any idea on how to fix this ?