SOLR-146: fix Solr::Response::Base.make_response raises misleading exception when response class exists but raises an exception on creation

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@505106 13f79535-47bb-0310-9956-ffa450edef68

client/ruby/solrb/lib/solr/response/base.rb

@@ -31,10 +31,12 @@ class Solr::Response::Base
     
     begin
       klass = eval(request.class.name.sub(/Request/,'Response'))
-      klass.new(raw)
-    rescue
+    rescue NameError
       raise Solr::Exception.new("unknown request type: #{request.class}")
+    else
+      klass.new(raw)
     end
+    
   end
 
 end