Improve testing the nested workflow tool

- Check if nesting processor doesn't already have a bound activity
diff --git a/taverna-scufl2-api/src/main/java/org/apache/taverna/scufl2/api/common/Scufl2Tools.java b/taverna-scufl2-api/src/main/java/org/apache/taverna/scufl2/api/common/Scufl2Tools.java
index 0823e3b..bb5bcbe 100644
--- a/taverna-scufl2-api/src/main/java/org/apache/taverna/scufl2/api/common/Scufl2Tools.java
+++ b/taverna-scufl2-api/src/main/java/org/apache/taverna/scufl2/api/common/Scufl2Tools.java
@@ -764,12 +764,10 @@
 		if(nestedWorkflowForProcessor(processor, profile) != null) {
 			throw new IllegalStateException("Processor " + processor + " already has a nested workflow");
 		}
-		try {
-			processor.getActivity(profile);
-			throw new IllegalStateException("Processor " + processor + " already has a bound activity");
-		} catch(IndexOutOfBoundsException e) {
-			// Processor should have no bound activity, which is the case here.
-		}
+        List<ProcessorBinding> processorBindings = processorBindingsForProcessor(processor, profile);
+        if(processorBindings.size() != 0) {
+            throw new IllegalStateException("Processor " + processor + "already has a binding")
+        }
 
 		Activity activity = createActivityFromProcessor(processor, profile);
 		activity.setType(NESTED_WORKFLOW);
diff --git a/taverna-scufl2-api/src/test/java/org/apache/taverna/scufl2/api/common/TestScufl2Tools.java b/taverna-scufl2-api/src/test/java/org/apache/taverna/scufl2/api/common/TestScufl2Tools.java
index 179553b..f336af0 100644
--- a/taverna-scufl2-api/src/test/java/org/apache/taverna/scufl2/api/common/TestScufl2Tools.java
+++ b/taverna-scufl2-api/src/test/java/org/apache/taverna/scufl2/api/common/TestScufl2Tools.java
@@ -51,6 +51,7 @@
 import org.apache.taverna.scufl2.api.profiles.Profile;
 import org.junit.Before;
 import org.junit.Test;
+import sun.security.krb5.Config;
 
 
 public class TestScufl2Tools extends ExampleWorkflow {
@@ -81,19 +82,13 @@
 
 		assertEquals(child, nested);
 
-		boolean found = false;
+		ProcessorBinding binding = processor.getBinding(profile);
+		Activity activity = binding.getBoundActivity();
+        Configuration configuration = activity.getConfiguration();
 
-		for(Activity activity: profile.getActivities()) {
-			if(activity.getType().equals(Scufl2Tools.NESTED_WORKFLOW)) {
-				for(Configuration config: tools.configurationsFor(activity, profile)) {
-					String nestedWorkflowName = config.getJson().get("nestedWorkflow").asText();
-					Workflow wf = workflowBundle.getWorkflows().getByName(nestedWorkflowName);
-					found |= (wf != null && nestedWorkflowName.equals(child.getName()));
-				}
-			}
-		}
-
-		assertTrue(found);
+        assertEquals(activity.getType(), Scufl2Tools.NESTED_WORKFLOW);
+        String nestedWorkflowName = configuration.getJson().get("nestedWorkflow").asText();
+        assertEquals(nestedWorkflowName, child.getName());
 	}
 	
 	@Test