Adjust HpricotMapperTest to not cause an error when the Hpricot library is not installed

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@540696 13f79535-47bb-0310-9956-ffa450edef68

client/ruby/solr-ruby/test/unit/hpricot_mapper_test.rb

@@ -10,6 +10,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+begin
   require 'solr'
   require 'test/unit'
   require 'hpricot'
@@ -38,3 +39,6 @@ class HpricotMapperTest < Test::Unit::TestCase
     end
 
   end
+rescue LoadError => e
+  puts "HpricotMapperTest not run because #{e}"
+end