software/jupyter: Fix jupyter notebook config file

software/jupyter/buildout.hash.cfg

@@ -23,7 +23,7 @@ md5sum = 9340498841caa5771f40f8c9e561eacd
 
 [jupyter-notebook-config]
 filename = jupyter_notebook_config.py.jinja
-md5sum = 6e01da7d35c1d65d4a450b0f011b296d
+md5sum = 089e4c511a3c7b110471bf41ca2695a4
 
 [erp5-kernel]
 filename = ERP5kernel.py

software/jupyter/jupyter_notebook_config.py.jinja

@@ -10,5 +10,12 @@ c = get_config()
 
 c.NotebookApp.password = passwd("{{ password }}")
 
-os.environ['PATH'] = "{{ gcc_location }}/bin" + os.pathsep + os.environ['PATH']
-os.environ['PYTHONPATH'] = "{{ cythonplus_repository }}" + os.pathsep + os.environ['PYTHONPATH']
+try:
+  os.environ['PATH'] = "{{ gcc_location }}/bin" + os.pathsep + os.environ['PATH']
+except KeyError:
+  os.environ['PATH'] = "{{ gcc_location }}/bin"
+
+try:
+  os.environ['PYTHONPATH'] = "{{ cythonplus_repository }}" + os.pathsep + os.environ['PYTHONPATH']
+except KeyError:
+  os.environ['PYTHONPATH'] = "{{ cythonplus_repository }}"