feature/Default folder to prompt when no default

Author: LewisYoul

app/controllers/snippets_controller.rb

@@ -165,7 +165,7 @@ def create
       language: snippet_params[:language],
     )
 
-    if snippet_params[:folder_id]
+    if snippet_params[:folder_id].present?
       folder = current_user.folders.find(snippet_params[:folder_id])
       snippet.folders << folder
     end

app/views/snippets/new.html.erb

@@ -30,7 +30,7 @@
       </div>
 
       <div class="create-snippet--options-wrapper">
-        <%= f.select :folder_id, options_from_collection_for_select(@folders, :id, :name, params[:folder_id]) %>
+        <%= f.select :folder_id, options_from_collection_for_select(@folders, :id, :name, params[:folder_id]), prompt: 'Select folder...' %>
         <%= f.select :language, [], {}, { data: { target: "highlight.languages" } } %>
         <%# <select v-model="snippetParams.language">
           <option v-for="language in languages" :key="language" :value="language">{{ language }}</option>