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File 'lib/tool_shed/galaxy_install/install_manager.py', line 872 in install_tool_shed_repository
install_dir = os.path.join(tool_path, relative_install_dir)
File '/home/exacloud/lustre1/galaxydev/galaxy/_conda/envs/_galaxy_18.05/lib/python2.7/posixpath.py', line 70 in join
elif path == '' or path.endswith('/'):
AttributeError: 'NoneType' object has no attribute 'endswith'