Fix NPE

Author: bbimber

SequenceAnalysis/api-src/org/labkey/api/sequenceanalysis/pipeline/PipelineStepProvider.java

@@ -83,6 +83,11 @@ public interface PipelineStepProvider<StepType extends PipelineStep>
      */
     public ToolParameterDescriptor getParameterByName(String name);
 
+    default boolean hasParameter(String name)
+    {
+        return getParameterByName(name) != null;
+    }
+
     /**
      * Creates the JSON object sent to the client that is used to build the client UI
      */

singlecell/src/org/labkey/singlecell/analysis/AbstractSingleCellHandler.java

@@ -184,7 +184,7 @@ public void init(JobContext ctx, List<SequenceOutputFile> inputFiles, List<Recor
 
                 if (step.requiresHashing(ctx))
                 {
-                    String methods = step.getProvider().getParameterByName("methods").extractValue(ctx.getJob(), step.getProvider(), step.getStepIdx(), String.class);
+                    String methods = step.getProvider().hasParameter("methods") ? step.getProvider().getParameterByName("methods").extractValue(ctx.getJob(), step.getProvider(), step.getStepIdx(), String.class) : null;
                     if (methods != null && methods.contains(CellHashingService.CALLING_METHOD.demuxem.name()))
                     {
                         doH5Caching = true;