Performs no-op when no text is selected

[benjaminchristie]

Before, when no text was selected, github was still searched when calling search and open. This commit instead performs a no-op when paired with this keymap:

local search_github = function ()
local csgithub = require("csgithub")
local url = csgithub.search({
includeFilename=false,
includeExtension=true,
})
if url == nil then
return
end
csgithub.open(url)
end

[thenbe]

I think this was opened by mistake, and the changes were already included in #2?

[benjaminchristie]

Closing, I thought I kept the two changes separate. May want to update README.md to account for nil return.