Fix the integration test

pkg/commands/oscommands/os.go

@@ -120,10 +120,12 @@ func (c *OSCommand) AppendLineToFile(filename, line string) error {
 		return utils.WrapError(err)
 	}
 
-	// read last char
 	buf := make([]byte, 1)
-	if _, err := f.ReadAt(buf, info.Size()-1); err != nil {
-		return utils.WrapError(err)
+	if info.Size() > 0 {
+		// read last char
+		if _, err := f.ReadAt(buf, info.Size()-1); err != nil {
+			return utils.WrapError(err)
+		}
 	}
 
 	// if the last byte of the file is not a newline, add it

test/integration/gitignoreMenu/expected/repo/.git_keep/config

@@ -3,8 +3,6 @@
 	filemode = true
 	bare = false
 	logallrefupdates = true
-	ignorecase = true
-	precomposeunicode = true
 [user]
 	email = CI@example.com
 	name = CI

test/integration/gitignoreMenu/expected/repo/.git_keep/info/exclude

@@ -4,4 +4,3 @@
 # exclude patterns (uncomment them if you want to use them):
 # *.[oa]
 # *~
-.DS_Store

test/integration/gitignoreMenu/expected/repo/.git_keep/logs/HEAD

@@ -1 +1 @@
-0000000000000000000000000000000000000000 9dd04ee245b7d6f1f80aa2b428111cbac4a4e37d CI <CI@example.com> 1657012500 +1000	commit (initial): Initial commit
+0000000000000000000000000000000000000000 022c2391c4f9e4a963e1c35a087f08772a4ea0f0 CI <CI@example.com> 1659505392 +0200	commit (initial): Initial commit

test/integration/gitignoreMenu/expected/repo/.git_keep/logs/refs/heads/master

@@ -1 +1 @@
-0000000000000000000000000000000000000000 9dd04ee245b7d6f1f80aa2b428111cbac4a4e37d CI <CI@example.com> 1657012500 +1000	commit (initial): Initial commit
+0000000000000000000000000000000000000000 022c2391c4f9e4a963e1c35a087f08772a4ea0f0 CI <CI@example.com> 1659505392 +0200	commit (initial): Initial commit

test/integration/gitignoreMenu/expected/repo/.git_keep/refs/heads/master

@@ -1 +1 @@
-9dd04ee245b7d6f1f80aa2b428111cbac4a4e37d
+022c2391c4f9e4a963e1c35a087f08772a4ea0f0

test/integration/gitignoreMenu/expected/repo/lg_ignore_file

@@ -1,2 +1,2 @@
 
-myfile1
+myfile1