Fix an NPE observed with Goby alignments. This looks like a symptom of a more serious problem. For instance, I am not sure why currentSamplingBucket is null for a Goby alignment, but not for an identical BAM alignment (currently testing BAM->Goby import).  Some recent changes to CachingQueryReader also seem to prevent displaying Goby splice links (there were showing before I updated, previously had a version about 2 weeks old).
Fix an NPE observed with Goby alignments. This looks like a symptom of a more serious problem. For instance, I am not sure why currentSamplingBucket is null for a Goby alignment, but not for an identical BAM alignment (currently testing BAM->Goby import).  Some recent changes to CachingQueryReader also seem to prevent displaying Goby splice links (there were showing before I updated, previously had a version about 2 weeks old).

git-svn-id: b5cf87c434d9ee7c8f18865e4378c9faabe04646@2219 17392f64-ead8-4cea-ae29-09b3ab513800

itenente/igv,itenente/igv,itenente/igv,itenente/igv,amwenger/igv,igvteam/igv,godotgildor/igv,godotgildor/igv,igvteam/igv,itenente/igv,igvteam/igv,amwenger/igv,igvteam/igv,amwenger/igv,godotgildor/igv,amwenger/igv,amwenger/igv,igvteam/igv,godotgildor/igv,godotgildor/igv