change logic for deletion when no user or no question is found

app/controllers/inbox_controller.rb

@@ -17,6 +17,7 @@ class InboxController < ApplicationController
                                                   .where(questions: { user_id: @target_user.id, author_is_anonymous: false })
                                                   .count
         if @inbox_author.empty?
+          @empty = true
           flash.now[:info] = "No questions from @#{params[:author]} found, showing default entries instead!"
         else
           @inbox = @inbox_author
@@ -28,7 +29,15 @@ class InboxController < ApplicationController
       end
     end
 
-    @disabled = true if @inbox.empty? or @not_found
+    if @empty or @not_found
+      @delete_id = "ib-delete-all"
+    elsif @author
+      @delete_id = "ib-delete-all-author"
+    else
+      @delete_id = "ib-delete-all"
+    end
+
+    @disabled = true if @inbox.empty?
     respond_to do |format|
       format.html
       format.js

app/views/inbox/_sidebar.html.haml

@@ -25,5 +25,5 @@
   .panel-heading
     %h3.panel-title= t 'views.inbox.sidebar.actions.title'
   .panel-body
-    %button.btn.btn-block.btn-danger{type: :button, id: @author ? 'ib-delete-all-author' : 'ib-delete-all', disabled: (@disabled ? 'disabled' : nil), data: { ib_count: @inbox_count }}= t 'views.inbox.sidebar.actions.button'
+    %button.btn.btn-block.btn-danger{type: :button, id: @delete_id , disabled: (@disabled ? 'disabled' : nil), data: { ib_count: @inbox_count }}= t 'views.inbox.sidebar.actions.button'