Do not allow workflows to run tools that are not workflow-compatible.

In the case of data-fetch there is extra validation that is done so this is somewhat important.

lib/galaxy/workflow/modules.py

@@ -809,6 +809,9 @@ def execute(self, trans, progress, invocation_step, use_cached_job=False):
         invocation = invocation_step.workflow_invocation
         step = invocation_step.workflow_step
         tool = trans.app.toolbox.get_tool(step.tool_id, tool_version=step.tool_version)
+        if not tool.is_workflow_compatible:
+            message = "Specified tool [%s] in workflow is not workflow-compatible." % tool.id
+            raise Exception(message)
         tool_state = step.state
         # Not strictly needed - but keep Tool state clean by stripping runtime
         # metadata parameters from it.