Fixes incorrect detection of the username

lib/common/models/wp_user/existable.rb

@@ -39,7 +39,7 @@ class WpUser < WpItem
     #
     # @return [ String ] The login
     def self.login_from_author_pattern(text)
-      return unless text =~ %r{/author/([^/\b]+)/?}i
+      return unless text =~ %r{/author/([^/\b"']+)/?}i
 
       Regexp.last_match[1].force_encoding('UTF-8')
     end

spec/shared_examples/wp_user/existable.rb

@@ -29,6 +29,13 @@ shared_examples 'WpUser::Existable' do
         @expected = nil
       end
     end
+
+    context 'when no author given' do
+      it 'returns nil' do
+        @text     = '<a href="http://wp.lab/author/" class="btn btn-default">See Posts</a>'
+        @expected = nil
+      end
+    end
   end
 
   describe '::login_from_body' do