Add comment to do not forget about potentially missing MAF records

src/main/java/org/cbioportal/file/export/MafRecordFetcher.java

@@ -72,6 +72,7 @@ public Iterator<MafRecord> fetch(Map<String, Set<String>> studyToSampleMap, Stri
                     mutation.getTumorRefCount(),
                     mutation.getNormalAltCount(),
                     mutation.getNormalRefCount()
+                    //TODO export mutation.annotationJSON ?
                 )).iterator();
         } catch (MolecularProfileNotFoundException e) {
             throw new RuntimeException(e);