Ensure character value is present when setting mapping

[pusewicz]

I believe the mapping should ensure the ch variable is not empty. This is what I get when opening a Ruby file when using ruby-lsp.

Vim verbose log:

autocommand lsp.AddFile(expand('<abuf>')->str2nr())

Executing: lsp.AddFile(expand('<abuf>')->str2nr())
line 2:     :set ballooneval balloonevalterm
line 15: inoremap <buffer> <silent> ( (<C-R>=g:LspShowSignature()<CR>
line 15: inoremap <buffer> <silent>    <C-R>=g:LspShowSignature()<CR>

No mapping found
line 15: inoremap <buffer> <silent> , ,<C-R>=g:LspShowSignature()<CR>
line 54:       doautocmd <nomodeline> User LspAttached
Executing User Autocommands for "LspAttached"
autocommand call OnLspAttached(

Update: In this scenario, the value of ch is a single space . Maybe it should be replaced with <Space>?