grab*_package: optimize for non-existent files
diff --git a/pym/portage/util/__init__.py b/pym/portage/util/__init__.py
index b32ebb8..e0908f0 100644
--- a/pym/portage/util/__init__.py
+++ b/pym/portage/util/__init__.py
@@ -381,6 +381,8 @@
 	""" Does the same thing as grabdict except it validates keys
 	    with isvalidatom()"""
 	pkgs=grabdict(myfilename, juststrings, empty=1, recursive=recursive)
+	if not pkgs:
+		return pkgs
 	if verify_eapi and eapi is None:
 		eapi = read_corresponding_eapi_file(myfilename)
 
@@ -402,6 +404,8 @@
 	remember_source_file=False, verify_eapi=False, eapi=None):
 
 	pkgs=grabfile(myfilename, compatlevel, recursive=recursive, remember_source_file=True)
+	if not pkgs:
+		return pkgs
 	if verify_eapi and eapi is None:
 		eapi = read_corresponding_eapi_file(myfilename)
 	mybasename = os.path.basename(myfilename)