[gnome-continuous-yocto/gnomeostree-3.28-rocko: 1584/8267] lib/oe/recipeutils: fix patch_recipe*() with empty input

[Emmanuele Bassi <ebassi src gnome org>]

commit 25507bfa82fc3bc46624952f15278b491a85ad7d
Author: Paul Eggleton <paul eggleton linux intel com>
Date:   Mon Jul 25 20:47:17 2016 +1200

    lib/oe/recipeutils: fix patch_recipe*() with empty input
    
    If you supplied an empty file to patch_recipe() (or an empty list to
    patch_recipe_lines()) then the result was IndexError because the code
    checking to see if it needed to add an extra line of padding didn't
    check to see if there were in fact any lines before trying to access the
    last line.
    
    Fixes [YOCTO #9972].
    
    (From OE-Core rev: 92a73e870478ddb2a2d137e3fff28828809bec2e)
    
    Signed-off-by: Paul Eggleton <paul eggleton linux intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oe/recipeutils.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meta/lib/oe/recipeutils.py b/meta/lib/oe/recipeutils.py
index 0e7abf8..c77664f 100644
--- a/meta/lib/oe/recipeutils.py
+++ b/meta/lib/oe/recipeutils.py
@@ -259,7 +259,7 @@ def patch_recipe_lines(fromlines, values, trailing_newline=True):
     changed, tolines = bb.utils.edit_metadata(fromlines, varlist, patch_recipe_varfunc, match_overrides=True)
 
     if remainingnames:
-        if tolines[-1].strip() != '':
+        if tolines and tolines[-1].strip() != '':
             tolines.append('\n')
         for k in remainingnames.keys():
             outputvalue(k, tolines)