[PATCH] Fixes "stg goto `stg top`" to no-op & test

["Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>]

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StGIT tried to access index that is not valid when goto'ing to
the current patch. Adds also a test for it.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
---
 stgit/commands/common.py |   17 ++++++++++-------
 t/t1600-goto-top.sh      |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/stgit/commands/common.py b/stgit/commands/common.py
index 1ea6025..88b1b94 100644
--- a/stgit/commands/common.py
+++ b/stgit/commands/common.py
@@ -200,16 +200,19 @@ def pop_patches(patches, keep = False):
     """Pop the patches in the list from the stack. It is assumed that
     the patches are listed in the stack reverse order.
     """
-    p = patches[-1]
-    if len(patches) == 1:
-        print 'Popping patch "%s"...' % p,
+    if len(patches) == 0:
+        print 'nothing to push/pop'
     else:
-        print 'Popping "%s" - "%s" patches...' % (patches[0], p),
-    sys.stdout.flush()
+        p = patches[-1]
+        if len(patches) == 1:
+            print 'Popping patch "%s"...' % p,
+        else:
+            print 'Popping "%s" - "%s" patches...' % (patches[0], p),
+        sys.stdout.flush()
 
-    crt_series.pop_patch(p, keep)
+        crt_series.pop_patch(p, keep)
 
-    print 'done'
+        print 'done'
 
 def parse_patches(patch_args, patch_list):
     """Parse patch_args list for patch names in patch_list and return
diff --git a/t/t1600-goto-top.sh b/t/t1600-goto-top.sh
new file mode 100755
index 0000000..94a88cf
--- /dev/null
+++ b/t/t1600-goto-top.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Catalin Marinas
+#
+
+test_description='Test the uncommit command.
+
+'
+
+. ./test-lib.sh
+
+test_expect_success \
+	'Initialize the StGIT repository' \
+	'stg init
+'
+
+test_expect_success \
+	'Create the first patch' \
+	'
+	stg new foo -m "Foo Patch" &&
+	echo foo > test &&
+	stg add test &&
+	stg refresh
+	'
+
+test_expect_success \
+	'Goto current patch' \
+	'
+	stg goto `stg top`
+	'
+
+test_done
-- 
1.4.2