Show error when no docs found

lib/pry/commands/show_doc.rb

@@ -35,6 +35,7 @@ class Pry
         # command '--help' shouldn't use markup highlighting
         docs
       else
+        raise CommandError, "No docs found for: #{obj_name}" if docs.empty?
         process_comment_markup(docs)
       end
     end

lib/pry/commands/show_source.rb

@@ -25,8 +25,6 @@ class Pry
 
     # The source for code_object prepared for display.
     def content_for(code_object)
-      cannot_locate_source_error if !code_object.source
-
       Code.new(code_object.source, start_line_for(code_object)).
         with_line_numbers(use_line_numbers?).to_s
     end

spec/commands/show_doc_spec.rb

@@ -10,12 +10,19 @@ if !PryTestHelpers.mri18_and_no_real_source_location?
       def @o.sample_method
         :sample
       end
+
+      def @o.no_docs;end
+
     end
 
     it 'should output a method\'s documentation' do
       pry_eval(binding, "show-doc @o.sample_method").should =~ /sample doc/
     end
 
+    it 'should raise exception when cannot find docs' do
+      lambda { pry_eval(binding, "show-doc @o.no_docs") }.should.raise(Pry::CommandError)
+    end
+
     it 'should output a method\'s documentation with line numbers' do
       pry_eval(binding, "show-doc @o.sample_method -l").should =~ /\d: sample doc/
     end

spec/fixtures/show_source_doc_examples.rb

@@ -1,5 +1,6 @@
 # used by test_show_source.rb and test_documentation.rb
 class TestClassForShowSource
+  #doc
   def alpha
   end
 end