errors on ArduPilot after a hang on git submodule --init --recursive

Traceback (most recent call last):
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Scripting.py", line 158, in waf_entry_point
    run_commands()
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Scripting.py", line 251, in run_commands
    ctx = run_command(cmd_name)
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Scripting.py", line 235, in run_command
    ctx.execute()
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Configure.py", line 159, in execute
    super(ConfigurationContext, self).execute()
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Context.py", line 204, in execute
    self.recurse([os.path.dirname(g_module.root_path)])
  File "/home/debian/bin/ardupilot/modules/waf/waflib/Context.py", line 286, in recurse
    user_function(self)
  File "/home/debian/bin/ardupilot/wscript", line 287, in configure
    cfg.get_board().configure(cfg)
  File "Tools/ardupilotwaf/boards.py", line 45, in configure
    self.configure_env(cfg, env)
  File "Tools/ardupilotwaf/boards.py", line 797, in configure_env
    super(blue, self).configure_env(cfg, env)
  File "Tools/ardupilotwaf/boards.py", line 665, in configure_env
    super(linux, self).configure_env(cfg, env)
  File "Tools/ardupilotwaf/boards.py", line 301, in configure_env
    cfg.srcnode.find_dir('modules/uavcan/libuavcan/include').abspath()
AttributeError: 'NoneType' object has no attribute 'abspath'