don't list directory contents of something that is empty

verse/distribusiworkflow.py

@@ -92,9 +92,10 @@ def RemoveMacFolders(path):
 def GetCssFile(distribusi):
     cssfile = ""
     cssfolder = os.path.join("themes/userthemes", distribusi.distribusiname)
-    for filename in os.listdir(cssfolder):
-        if filename.endswith(".css"):
-            cssfile = os.path.join(cssfolder, filename)
+    if os.path.exists(cssfolder):
+        for filename in os.listdir(cssfolder):
+            if filename.endswith(".css"):
+                cssfile = os.path.join(cssfolder, filename)
     return cssfile