Fixed OPM export for workflows using Controlflow Assistant

OPM assumes some Map inputs are functions, but CF uses connections.
In this case we cannot compute the provenance for the Map.

vistrails/db/services/opm.py

@@ -271,6 +271,10 @@ def process_map(module, found_input_ports, found_output_ports):
             # need to have process that extracts artifacts for each iteration
             input_list_artifact = found_input_ports['InputList']
             result_artifact = found_output_ports.get('Result', None)
+            # if InputPort or OutputPort is a Connection we cannot do anything
+            if (found_input_ports['InputPort'].vtType == DBConnection.vtType or
+                found_input_ports['OutputPort'].vtType == DBConnection.vtType):
+                return
             input_port_list = \
                 literal_eval(found_input_ports['InputPort'].db_parameters[0].db_val)
             output_port = \