Add specs to ensure internal url are blocked

Also rescue Gitlab::HTTP::BlockedUrlError

ee/lib/gitlab/ci/external/file/remote.rb

@@ -12,7 +12,7 @@ module Gitlab
             @content = strong_memoize(:content) do
               begin
                 Gitlab::HTTP.get(location)
-              rescue Gitlab::HTTP::Error, Timeout::Error, SocketError
+              rescue Gitlab::HTTP::Error, Timeout::Error, SocketError, Gitlab::HTTP::BlockedUrlError
                 nil
               end
             end

ee/spec/lib/gitlab/ci/external/file/remote_spec.rb

@@ -50,6 +50,14 @@ describe Gitlab::Ci::External::File::Remote do
         expect(remote_file.valid?).to be_falsy
       end
     end
+
+    context 'with an internal url' do
+      let(:location) { 'http://localhost:8080' }
+
+      it 'should be falsy' do
+        expect(remote_file.valid?).to be_falsy
+      end
+    end
   end
 
   describe "#content" do
@@ -84,6 +92,14 @@ describe Gitlab::Ci::External::File::Remote do
         expect(remote_file.content).to be_nil
       end
     end
+
+    context 'with an internal url' do
+      let(:location) { 'http://localhost:8080' }
+
+      it 'should be nil' do
+        expect(remote_file.content).to be_nil
+      end
+    end
   end
 
   describe "#error_message" do