fix(ci): add workaround for undo_ftplugin error

Author: dcampos

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Setup vusted
         run: |
-          luarocks install vusted 2.3.4-1
+          luarocks install vusted
 
       - name: Run functional tests
         env:

test/unit/reader_spec.lua

@@ -111,6 +111,8 @@ describe('Snippet reader', function()
         local total_failed = {}
         local count = 0
         for _, scope in ipairs(scopes) do
+            -- Workaround for when there is no undo_ftplugin set
+            vim.b.undo_ftplugin = vim.b.undo_ftplugin or ''
             vim.cmd('set filetype=' .. scope)
             local snips = snippy.snippets
             assert.is_not.equal(nil, snips[scope])