util.py: use passed package_versions dict even if empty

Signed-off-by: Dan Mick <dan.mick@redhat.com>

diff --git a/teuthology/suite/util.py b/teuthology/suite/util.py
index 65fb1bf3fc022ef2326b2f8f6c7d82473ff4a70f..ef771671f14829dd25056135e53aff8a44720c2e 100644 (file)
--- a/teuthology/suite/util.py
+++ b/teuthology/suite/util.py
@@ -358,7 +358,7 @@ def get_package_versions(sha1, os_type, kernel_flavor, package_versions=None):
                              for all hashs and distros, not just for the given
                              hash and distro.
     """
-    if not package_versions:
+    if package_versions is None:
         package_versions = dict()
 
     os_type = str(os_type)
@@ -415,7 +415,7 @@ def has_packages_for_distro(sha1, os_type, kernel_flavor,
     :returns:                True, if packages are found. False otherwise.
     """
     os_type = str(os_type)
-    if not package_versions:
+    if package_versions is None:
         package_versions = get_package_versions(sha1, os_type, kernel_flavor)
 
     package_versions_for_hash = package_versions.get(sha1, dict()).get(