Use first binding when there is no application binding

If an error happens inside the framework before loading application,
the ActionDispatch::ExceptionWrapper shows traces for the framework only.
It could be outside of "Rails.root", and so we have to fallback to the first one.

Author: sh19910711

lib/web_console/session.rb

@@ -43,7 +43,7 @@ def from(storage)
     def initialize(bindings)
       @id = SecureRandom.hex(16)
       @bindings = Array(bindings)
-      @evaluator = Evaluator.new(initial_binding)
+      @evaluator = Evaluator.new(application_binding || @bindings.first)
 
       store_into_memory
     end
@@ -64,7 +64,7 @@ def switch_binding_to(index)
 
     private
 
-      def initial_binding
+      def application_binding
         @bindings.find { |b| b.eval('__FILE__').to_s.start_with?(Rails.root.to_s) }
       end