Multiquery execution of RANK with RANK BY causes NPE JobCreationException "ERROR 2017: Internal error creating job configuration"

-- disable multiquery and you can rank all day long
-- SET opt.multiquery false

citypops = LOAD 'us_city_pops.tsv' AS (city:chararray, state:chararray, pop_2011:int);
citypops_o = ORDER citypops BY city;

--
-- if you have one non-by RANK you may not have any other RANKs
--

citypops_nosort_inplace    = RANK citypops;
citypops_presorted_inplace = RANK citypops_o;
citypops_ties_cause_skips  = RANK citypops   BY city;
citypops_ties_no_skips     = RANK citypops   BY city  DENSE;
citypops_presorted_ranked  = RANK citypops_o BY city;

STORE citypops_nosort_inplace    INTO '/tmp/citypops_nosort_inplace'    USING PigStorage('\t', '--overwrite true');
-- STORE citypops_presorted_inplace INTO '/tmp/citypops_presorted_inplace' USING PigStorage('\t', '--overwrite true');

STORE citypops_ties_cause_skips  INTO '/tmp/citypops_ties_cause_skips'  USING PigStorage('\t', '--overwrite true');
-- STORE citypops_ties_no_skips     INTO '/tmp/citypops_ties_no_skips'     USING PigStorage('\t', '--overwrite true');
-- STORE citypops_presorted_ranked  INTO '/tmp/citypops_presorted_ranked'  USING PigStorage('\t', '--overwrite true');

Pig Stack Trace
---------------
ERROR 2017: Internal error creating job configuration.

org.apache.pig.backend.hadoop.executionengine.JobCreationException: ERROR 2017: Internal error creating job configuration.
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.getJob(JobControlCompiler.java:946)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.compile(JobControlCompiler.java:322)
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher.launchPig(MapReduceLauncher.java:200)
     --- SNIP ----
Caused by: java.lang.NullPointerException
        at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.JobControlCompiler.getJob(JobControlCompiler.java:886)
        ... 19 more

            if(mro.isRankOperation()) {
                Iterator<String> operationIDs = mro.getRankOperationId().iterator();

                while(operationIDs.hasNext()) {
                    String operationID = operationIDs.next();
                    Iterator<Pair<String, Long>> itPairs = globalCounters.get(operationID).iterator();
                    Pair<String,Long> pair = null;
                    while(itPairs.hasNext()) {
                        pair = itPairs.next();
                        conf.setLong(pair.first, pair.second);
                    }
                }
            }