fix issue #4577 (#4579)

2017-06-21 16:33:11 -07:00 · 2017-06-21 16:33:11 -07:00 · 689c1d2f0c
commit 689c1d2f0c
parent a113101126
1 changed files with 1 additions and 1 deletions
--- a/lib/spack/spack/util/executable.py
+++ b/lib/spack/spack/util/executable.py
@ -239,7 +239,7 @@ def which(*args, **kwargs):
    Returns:
        Executable: The first executable that is found in the path
    """
-    path = kwargs.get('path', os.environ.get('PATH'))
+    path = kwargs.get('path', os.environ.get('PATH', ''))
    required = kwargs.get('required', False)

    if isinstance(path, string_types):