nvim: snippets: don't fail if name/email not found

.config/nvim/lua/my/functions.lua

@@ -101,8 +101,8 @@ end
 
 function MY_shell_capture(command)
     local handle = io.popen(command)
-    if not handle then return '' end
-    local result = handle:read() or ''
+    if not handle then return nil end
+    local result = handle:read() or nil
     handle:close()
     return result
 end

.config/nvim/snippets/cpp.lua

@@ -61,9 +61,11 @@ return {
             end),
             name = f(function()
                 return MY_shell_capture('git config user.name')
+                    or 'INSERT_NAME'
             end),
             email = f(function()
                 return MY_shell_capture('git config user.email')
+                    or 'INSERT_EMAIL'
             end),
             cursor = i()
         })
@@ -85,9 +87,11 @@ return {
             end),
             name = f(function()
                 return MY_shell_capture('git config user.name')
+                    or 'INSERT_NAME'
             end),
             email = f(function()
                 return MY_shell_capture('git config user.email')
+                    or 'INSERT_EMAIL'
             end),
             cursor = i()
         })