SSDM-4135: fixing NPE bug in modified V3 API executors

SVN: 37128

openbis/source/java/ch/ethz/sis/openbis/generic/server/asapi/v3/executor/sample/SetSampleExperimentExecutor.java

@@ -48,7 +48,10 @@ public class SetSampleExperimentExecutor extends AbstractSetEntityExperimentRela
     @Override
     protected void set(IOperationContext context, SamplePE entity, ExperimentPE related)
     {
-        relationshipService.assignSampleToExperiment(context.getSession(), entity, related);
+        if (related != null)
+        {
+            relationshipService.assignSampleToExperiment(context.getSession(), entity, related);
+        }
     }
 
 }

openbis/source/java/ch/ethz/sis/openbis/generic/server/asapi/v3/executor/sample/SetSampleProjectExecutor.java

@@ -75,7 +75,10 @@ public class SetSampleProjectExecutor extends AbstractSetEntityToOneRelationExec
     @Override
     protected void set(IOperationContext context, SamplePE entity, ProjectPE related)
     {
-        relationshipService.assignSampleToProject(context.getSession(), entity, related);
+        if (related != null)
+        {
+            relationshipService.assignSampleToProject(context.getSession(), entity, related);
+        }
     }
 
 }