Fix- Search form in 404 will not search at all
Fix- Search form in 404 will not search at all

Check used to look for main navigation tipue_search_input value.length which was empty.
On the other hand 404 search form has value in it.

This fix checks for the value of 404 search form separately.

Goclis/pelican-blog,Goclis/pelican-blog,Goclis/pelican-blog,Goclis/pelican-blog