Fix: don't raise on invalid URIs

In the initial implementation to support URIs, I overlooked that it
could raise an exception. This is now handled, in which case we treat
the input String as plain text, instead of decomposing it into tokens.

The code triggers Rubocop's desire to have shorter methods, so I'll see
about reducing the complexity of the method next.

lib/groupie/tokenizer.rb

@@ -51,6 +51,9 @@ def strip_html_tags!
     def tokenize_urls!
       @raw.gsub!(%r{http[\w\-\#:/_.?&=]+}) do |url|
         uri = URI.parse(url)
+      rescue URI::InvalidURIError
+        url
+      else
         path = uri.path.to_s
         path.tr!('/_\-', ' ')
         query = uri.query.to_s

spec/groupie_spec.rb

@@ -228,6 +228,10 @@
         %w[https example.org blog path 2022 1234 title of blog post custom query foo bar my anchor]
       )
     end
+
+    it 'treats invalid URLs as plain text' do
+      expect(Groupie.tokenize('http://localhost:3000&amp')).to eq(%w[http localhost 3000 amp])
+    end
   end
 
   describe 'when smart_weight is enabled' do